Ultralow Reflectance Research Articles

Research on Efficient Electromagnetic Shielding Performance and Modulation Mechanism of Aero/Organo/Hydrogels with Gravity-Induced Asymmetric Gradient Structure.

To eliminate electromagnetic pollution, it is a challenging task to develop highly efficient electromagnetic shielding materials that integrate microwave absorption (MA) performance with high shielding capability and achieve tunability in shielding performance. Asymmetrically structured aero/organo/hydrogels with a progressively changing concentration gradient of liquid metal nanoparticles (LMNPs), induced by gravity, are prepared by integrating the conductive fillers Ti3C2Tx MXene and LMNPs into a dual-network structure composed of polyvinyl alcohol and cellulose nanofibers. Benefiting from the unique structure, which facilitates the absorption-reflection-reabsorption process of electromagnetic waves along with conductive fillers and the porous structure, three types of gels demonstrate efficient shielding performance. HPCML achieves a total shielding effectiveness (SET) of up to 86.9dB and a reflection shielding effectiveness (SER) of as low as 2.85dB. Especially, APCML, with an ultra-low reflection coefficient (R) of 6.4%, achieves compatibility between shielding performance and MA properties. The relationship between dispersing media (air, water, and glycerol/water) and the shielding performance of aero/organo/hydrogels is explored, thereby achieving modulation of the shielding performance of the gel system. The work has paved a clear path for integrating absorption and shielding capabilities into a composite material, thereby providing a prototype of a highly efficient shielding material with MA performance.

Preparation and performance control of ultra-low near-infrared reflectivity coatings with super-hydrophobic and outstanding mechanical properties

The development of ultra-low near-infrared reflectivity coatings with outstanding engineering properties remains a challenge in laser stealth materials research. Herein, we reported a laser stealth coating with outstanding mechanical properties, super-hydrophobicity, and an ultra-low near-infrared reflectivity for 1.06 μm wavelength. The effects of the mass ratio of graphene to nano-SiO2, the proportion of total filler, the addition of KH560, the mass ratio of Polydimethylsiloxane (PDMS) to acrylic-modified polyurethane (APU), and the addition of dioctyl phthalate (DOP) on the coating properties were thoroughly discussed. The coating can achieve a low reflectivity of 9.3% at 1.06 μm and a high water contact angle of 152° at a mass ratio of 7:3 for PDMS to APU and 6:4 for graphene to nano-SiO2 with a total filler amount of 40 wt%. KH560 can play a bridging role between the blended resin matrix and nano-SiO2, which can significantly improve the impact strength of the coating. The DOP, which contains a polar ester group and a non-polar carbon chain structure, can be inserted between the molecular chains of the resin to weaken the intermolecular force of the resin, so that the flexibility of the coating can be significantly improved. Adding KH560 at 4 wt% and DOP at 1 wt%, resulted in a coating with ultra-low near-infrared reflectivity of 1.06 μm (9.3%), super-hydrophobic properties, outstanding adhesion strength (grade 2), flexibility (2 mm), and impact strength (50 kg cm). The above super-hydrophobic ultra-low near-infrared reflectivity coating has significant potential for use in the field of laser stealth equipment, and it can serve as a useful reference for optimizing the mechanical properties of super-hydrophobic functional coatings.

Ultrahigh absorption dominant EMI shielding polyimide composites with enhanced piezoelectric property

Piezoelectric sensors have been widely used in wearable electronic devices with improved integration, which is prone to cause electromagnetic interference (EMI) pollution and affects its operation stability. How to design the materials with integrated piezoelectric sensing and EMI shielding performance is of great significance. In this paper, the Fe3O4@PPy/PINF (FPN) composite film was prepared by depositing pyrrole (Py) on the surface of Fe3O4 nanoparticles and combining it with polyimide (PI) nanofibrous membrane via vacuum-assisted suction filtration. In addition, after encapsulation with a highly soluble fluorine-containing polyimide (FPI) resin, a structurally stable FPI-Fe3O4@PPy/PINF (PFPN) composite film was obtained. The prepared PFPN composites show excellent EMI shielding effectiveness (44.58 dB) through the secondary reflection and multiple absorption effects. Remarkably, the value of the absorption coefficient A can reach 0.74, showing outstanding absorption characteristics. In addition, PFPN composite film also shows unexpected piezoelectric properties with high sensitivity of S = 0.8, short response (25 ms) and recovery (45 ms) time. Its piezoelectric output can reach 4.2 V with stable cyclic output property (>15000 times). This kind of composite film with ultra-low reflection characteristics and favorable piezoelectricity presents a wide range of potential applications in the self-powered wearable electronic fields.

Enhanced electromagnetic interference shielding via surface-bound molecules and synergistically amplified polarization and triboelectrification

Achieving high-performance electromagnetic interference (EMI) shielding materials with ultra-low reflectivity, minimal volume, and light weight is challenging. This study addresses this by introducing a nanofiber (NF)-based structure composed of MXene nanoflakes and ferroelectric barium titanate oxide (BTO) nanoparticles embedded within polyurethane (PU) fibers, and surface-bound branched polyethyleneimine (PEI(b)) on the NFs. This design enhances the flexibility and lightness of the EMI shielding materials while effectively minimizing reflectivity. A key approach in this study is the functionalization of the NFs with branched polyethyleneimine (PEI(b)), which reduces reflectivity and enhances EMI shielding effectiveness (SE). The surface-bound molecules increase the effective surface area, improving the absorption efficiency of incident electromagnetic waves without adding weight or volume. Additionally, the surface-bound PEI(b) molecules synergistically enhance the polarization of the embedded BTO nanoparticles and amplify the triboelectric charging effect, crucial for achieving ultra-low reflectivity and high EMI SE. Combining the optimized composite NF design with these enhancement methods, this study achieves significant advancements in EMI SE, reaching an EMI SE of 72 dB, an absolute EMI SE (SSEt) of 28,460 dB·cm²g−1, and a reflectivity of 0.09, all without increasing weight or volume. This approach exemplifies how the strategic application of surface-bound molecules can enhance EMI shielding effectiveness and achieve ultra-low reflectivity through the effective expansion of the absorption surface and synergistic enhancement of piezoelectric and triboelectric effects.

Silicon Subwavelength Grating Coupler With Ultra-High Reproducibility, Ultra-Wide Bandwidth, and Ultra-Low Back Reflection

Silicon Subwavelength Grating Coupler With Ultra-High Reproducibility, Ultra-Wide Bandwidth, and Ultra-Low Back Reflection

Absorption‐Dominant Electromagnetic Interference (EMI) Shielding across Multiple mmWave Bands Using Conductive Patterned Magnetic Composite and Double‐Walled Carbon Nanotube Film

AbstractThe revolution of millimeter‐wave (mmWave) technologies is prompting a need for absorption‐dominant EMI shielding materials. While conventional shielding materials struggle in the mmWave spectrum due to their reflective nature, this study introduces a novel EMI shielding film with ultralow reflection (<0.05 dB or 1.5%), ultrahigh absorption (>70 dB or 98.5%), and superior shielding (>70 dB or 99.99999%) across triple mmWave frequency bands with a thickness of 400 µm. By integrating a magnetic composite layer (MCL), a conductive patterned grid (CPG), and a double‐walled carbon nanotube film (DWCNTF), specific resonant frequencies of electromagnetic waves are transmitted into the film with minimized reflection, and trapped and dissipated between the CPG and the DWCNTF. The design factors for resonant frequencies, such as the CPG geometry and the MCL refractive index, are systematically investigated based on electromagnetic wave propagation theories. This innovative approach presents a promising solution for effective mmWave EMI shielding materials, with implications for mobile communication, radar systems, and wireless gigabit communication.

Analytical modeling of acoustic exponential materials and physical mechanism of broadband anti-reflection

Spatially exponential distributions of material properties are ubiquitous in many natural and engineered systems, from the vertical distribution of the atmosphere to acoustic horns and anti-reflective coatings. These media seamlessly interface different impedances, enhancing wave transmission and reducing internal reflections. This work advances traditional transfer matrix theory by integrating analytical solutions for acoustic exponential materials, which possess exponential density and/or bulk modulus, offering a more accurate predictive tool and revealing the physical mechanism of broadband anti-reflection for sound propagation in such non-uniform materials. Leveraging this method, we designed an acoustic dipole array that effectively mimics exponential mass distribution. Through experiments with precisely engineered micro-perforated plates, we demonstrate an ultra-low reflection rate of about 0.86% across a wide frequency range from 420 Hz to 10,000 Hz. Our modified transfer matrix approach underpins the design of exponential materials, and our layering strategy for stacking acoustic dipoles suggests a pathway to more functional gradient acoustic metamaterials.

Micro nano antireflective and hydrophobic hierarchical structures ZnS by femtosecond laser

Antireflective hydrophobic hierarchical structures were fabricated on ZnS with ultralow reflectance by femtosecond laser. By adjusting the scanning interval, laser scanning speed and laser power, different kinds of hierarchical structures were obtained. The hierarchical structures combined the light trapping effect of micro-structures and effective refractive index medium effect of nano structures, greatly reduced the reflectance. At optimal parameters, the reflectance of ZnS with hierarchical structures decreased to lower than 1.4 % in the wavelength of 500–2500 nm. Besides, the hierarchical structures featured good hydrophobic performance with contact angle of 114°. This work provided a new way for the surface antireflection and hydrophobicity process, which could be widely used in the optical windows, and photoelectron devices.

Ultra-low reflection electromagnetic interference shielding nanofiber film with effective solar harvesting and self-cleaning

It is urgent to develop low-reflection electromagnetic interference shielding material to shield electromagnetic waves (EMW) and reduce their secondary radiation pollution. Herein, an electromagnetic interference shielding nanofiber film is composed of ZnO and carbon nanofiber (CNF) via electrospinning and carbonization approachs, and subsequently coating perfuorooctyltriethoxysilane as a protective layer. On the one hand, ZnO coated by porous carbon, which is derived from ZIF-8, endows the nanofiber film low reflection property through optimizing impedance matching between free space and the nanofiber film. On the other hand, the nanofiber film possesses high electromagnetic interference shielding efficiency, which is beneficial by excellent electrical conductivity of CNF derived from waste leather scraps. Furthermore, the nanofiber film involves abundant interface, which contributes to high interfacial polarization loss. Thus, the nanofiber film with a thickness of 250 μm has electrical conductivity of 53 S/m and shielding efficiency of 50 dB. The reflection coefficient of the nanofiber film is inferior to 0.4 indicates that most of EMW are absorbed inside the materials and the nanofiber film is effective in reducing secondary radiation contamination of electromagnetic waves. Fortunately, the nanofiber film exhibits outstanding solar harvesting performance (106 ℃ at 1 sun density) and good self-cleaning performance, which ensure that the nanofiber film can work in harsh environments. This work supplies a credible reference for fabricating low-reflection electromagnetic shielding nanofiber film to reduce secondary radiation pollution and facilitates the upcycling of waste leather scraps.Graphic abstract

Preparation and properties of multi-color coatings with ultra-low near-infrared reflectivity

In this paper, a high-performance laser and visible multi-spectrum compatible stealth coating with brown earth color and medium green color was prepared by using graphene as laser absorbing pigment, earthy yellow and medium yellow color pastes as coloring pigments, and polyurethane (PU) as adhesive, respectively. The effects of graphene addition amount, type and content of coloring pigment on the color, 1.06 μm near-infrared reflectivity, and mechanical properties of the coating were systematically studied. The results indicate that graphene was used as the laser absorbing pigment to effectively reduce the spectral reflectivity of the coating at the wavelength of 1.06 μm. With the increase of graphene content, the reflectivity of the coating to 1.06 μm near-infrared light decreases first and then increases slightly. When the graphene content is 4 wt%, the reflectivity of the coating to 1.06 μm near-infrared light can be reduced to 3.0 %, which achieves the performance requirement of ultra-low near-infrared reflectivity and makes the coating have outstanding laser stealth performance. When the amount of graphene is 4 wt%, earthy yellow and medium yellow color pastes are used as the coloring pigments. With the increase of the color paste addition, the coating can gradually show the color characteristics of earth and green. When the mass ratio of graphene to the two color pasts is 1:10, the two coatings prepared have bright brown earth color and medium green color characteristics, respectively, and the reflectivity of the coatings to 1.06 μm near-infrared light can be as low as less than 10 %, which well meets the requirements of laser and visible light compatible stealth. In addition, the prepared coating has excellent mechanical properties.

Multifunctional phase-change composites for green electromagnetic interference shielding and thermal response prepared under the guidance of an impedance matching strategy.

With the advent of the information age, electromagnetic hazards are becoming more serious. In view of environmental protection, green electromagnetic interference (EMI) shielding materials with little or no secondary reflection have become the ideal choice. In this paper, by freeze-drying, high-temperature carbonization, coating and impregnation backfilling, we prepared carbonized Ni-MOF/reduced graphene oxide/silver nanowire-polyimide@polyethylene glycol composites (Ni@C/r-GO/AgNW-PI@PEG) with gradient conductivity based on impedance matching. The impedance matching layer Ni@C/r-GO-300 reduces the reflection of electromagnetic waves from the surface of the material, the dissipation layer Ni@C/r-GO-600 provides excellent electromagnetic wave dissipation capability, and the reflection layer AgNW-PI ensures that the electromagnetic waves are reflected back into the material. Meanwhile, the EMI shielding performance value of Ni@C/r-GO/AgNW-PI@PEG reaches 62.3 dB with an ultra-low reflectivity (R) of 0.04. In CST simulations, the intrinsic mechanism of electromagnetic energy loss within the material is revealed by energy loss density cloud maps. In addition, heat from high-temperature objects is transferred through the highly thermally conductive AgNW-PI membrane to the long-channel Ni@C/r-GO backbone. Therefore, the composites prepared on the basis of impedance matching will accelerate the use of EMI shielding materials for the thermal management of portable electronic devices and battery heat dissipation packaging.

WDM C-band four channel demultiplexer using cascaded multimode interference on SiN strip waveguide structure

Back reflection challenges significantly constrain the efficiency of optical communication networks employing dense wavelength division multiplexing (DWDM) technology, particularly those based on Silicon (Si) Multimode Interference (MMI) waveguides. To mitigate this limitation, we present a novel 1×4 optical demultiplexer design using MMI within a Silicon-Nitride (SiN) strip waveguide configuration, operating within the C-band spectrum. Our design was optimized using AI-enhanced RSoft-CAD simulations that combined the Beam Propagation Method (BPM) and Finite-Difference Time-Domain (FDTD) techniques, integrated with convolutional neural network (CNN) machine learning algorithms. The simulation results demonstrate that the proposed device efficiently transmits four channels with 10 nm spacing in the C-band, showing low power loss ranging from 1.98-2.35 dB, a broad bandwidth of 7.68-8.08 nm, and excellent crosstalk suppression between 20.8-23.4 dB. Leveraging the low refractive index of SiN, we achieve ultra-low back reflection of 40.58 dB without requiring specialized angled MMI designs, which are often necessary in Si-based MMI technology. Consequently, this SiN-based MMI demultiplexer provides an effective solution for DWDM systems, enabling high data transmission rates with minimal back reflection in optical communication networks.

Fabrication of electrically conductive interconnected microcellular thermoplastic elastomeric foam composite for absorption dominating electromagnetic interference shielding with ultra low reflection

AbstractThe elevated rates of electromagnetic radiation pollution, resulting from the growing need for wireless communication systems and electronic gadgets, have sparked interest in creating shielding materials that are lightweight, flexible, non‐corrosive, simply processable, and affordable. In this study, a collection of microcellular nanocomposites based on ethylene octane copolymer (EOC) were created utilizing Vulcan XC 72 conductive carbon black (VCB) by a dual mixing process involving both melt and solution mixing. A chemical blowing agent was utilized to induce the cellular architecture in the composite, resulting in its lightweight nature (maximum density of 0.65 g/cc). The composite foam, when loaded with 30 parts per hundred of volume (phr) of VCB, displays a conductive network and also achieves an electromagnetic interference (EMI) shielding efficiency of 23.2 decibels (dB), satisfying commercial requirements. Furthermore, the findings indicated that the composite's cellular structure significantly influences the absorption‐dominated EMI shielding mechanism with an absorption rate of 89%–94% and a specific shielding effectiveness of 194 dBcm2/g within the frequency range of 8.2–12.4 GHz (X band). The foam composite also demonstrated as a thermal management system, with a maximum thermal conductivity of 0.3 W/mK. As a result, this lightweight, easily processable, electrical conductive EOC/VCB polymer composite foams are projected to be used as EMI shielding materials in electronics, cars, and packaging.Highlights Fabrication of lightweight microcellular Carbon black‐loaded EOC composite Rheological, mechanical, and thermal properties of foam composites The cell density filled composites reduces by the cellular foam structures Carbon black pronouncedly enhanced the electrical conductivity of foam composite An absorption‐dominated shielding effectiveness with ultra‐low reflection.

Light and triboelectrification management by nanostructure coupled with plasma-polymerized-fluorocarbon thin film for enhancing performance of energy harvestings

Nanostructures are pivotal in enlarging surface area, increasing transparency, and enhancing power generation. We presented a novel methodology that employs plasma from a linear ion beam source to fabricate irregular nanostructures on a colorless polyimide (CPI) surface. This innovative technique improves transparency, positioning it as an attractive choice for energy and optoelectronic applications. Furthermore, we enhanced the nanostructured CPI surface by applying a plasma-polymerized-fluorocarbon (PPFC). This coating, notable for its low refractive index and superior triboelectrification properties, enabled us to attain ultra-low reflectance (<1%) and a high surface charge density. Integrating PPFC with nanostructured CPI, we amplified the effective surface area of a triboelectric nanogenerator (TENG) by 14.8%, leading to a boost in TENG performance with outputs reaching 184.0 V and 72.8 μA. We also introduced a figure of merit (FOM) for transparent TENGs. The FOM for PPFC/nanostructured CPI exhibits an impressive value of 206.5. In flexible perovskite solar cells (f-PSCs) incorporating PPFC/nanostructured CPI, we observed an increase in short-circuit current density from 22.61 to 23.24 mA/cm2 and an enhancement in power conversion efficiency from 17.47% to 18.25%. Our results validate the efficacy of this approach in both transparent TENGs and f-PSCs, marking a substantial advancement in their performance.

Random Raman Fiber Laser as a Liquid Refractive Index Sensor

In this paper, a new concept of forward-pumped random Raman fiber laser (RRFL)-based liquid refractive index sensing is proposed for the first time. For liquid refractive index sensing, the flat fiber end immersed in the liquid can act as the point reflector for generating random fiber lasing and also as the sensing head. Due to the high sensitivity of the output power of the RRFL to the reflectivity provided by the point reflector in the ultralow reflectivity regime, the proposed RRFL is capable of achieving liquid refractive index sensing by measuring the random lasing output power. We theoretically investigate the effects of the operating pump power and fiber length on the refractive index sensitivity for the proposed RRFL. As a proof-of-concept demonstration, we experimentally realize high-sensitivity half-open short-cavity RRFL-based liquid refractive index sensing with the maximum sensitivity and the sensing resolution of–39.88W/RIU and 2.5075×10−5 RIU, respectively. We also experimentally verify that the refractive index sensitivity can be enhanced with the shorter fiber length of the RRFL. This work extends the application of the random fiber laser as a new platform for highly-sensitive refractive index sensing in chemical, biomedical, and environmental monitoring applications, etc.

Research on the Absorption Performance of Silicon-Based Pyramidal Microstructure with Ultra-Low Reflectivity

Anti-reflective structure can effectively suppress the light reflection on the surface of the object, thereby increasing the absorption of light, it has a wide range of applications in photovoltaics, such as optical sensors and photodetectors. Due to the limitation of low refractive index materials, it is difficult for existing anti-reflective coatings to achieve the expected low reflectance effect. Based on Maxwell’s electromagnetic wave theory, this paper uses Finite-Difference Time-Domain (FDTD)-solutions software to research the reflection spectrum of silicon-based pyramidal microstructure in the wavelength range of 200–1400nm, explores the influence of the height (H) and bottom side length (L) of the pyramidal on its reflection spectrum, and studies the changes of its electromagnetic field. On this basis, the absorption performance of the silicon-based pyramidal microstructure is further studied, and it is found that the absorption efficiency of silicon-based pyramidal microstructure for ultraviolet light reaches almost 100%, which provides important significance for its application in optical sensors and photodetectors.

Nanophotonic broadband infrared antireflection coatings based on dielectric Si3N4 nano-pillar arrays

Dielectric Si3N4 nano-pillar arrays (NPA) are designed for the broad infrared waveband antireflection applications. The Wood-Rayleigh anomaly diffraction and Mie-type scattering (M − S) resonance characteristics of the NPA nanophotonic structures are analyzed, which show the excellent optical performances. M − S resonance can be broadened by high-index semiconductor substrate and the interactions between nanopillars, which resulting the expected ultra-low light reflection at the broad infrared waveband. The orderly and uniformly large area Si3N4 NPAs are successfully fabricated by low-cost nanosphere lithography, and the measured infrared light reflection spectrums are fit well with the theoretical results. For the GaSb TPV cell with the emitter temperature of 1200 °C, the ultralow flux-spectrum-weighted reflection of ∼1.72 % is obtained with the fabricated Si3N4 NPA, which demonstrate great potential for infrared optoelectronic applications.

Design of a novel anti-reflective coating with ultra-low reflectance based on resin-anchored hollow silica strategy

The strategy of resin-anchored hollow silica particles (HSPs) offers a tempting option for large-scale fabrication of anti-reflective functional surfaces on flexible plastic substrates. However, attempts to experimentally investigate the structure-performance relationship of such anti-reflective coatings and to further optimize the coating structure require long experimental cycles and significant labor costs. In view of this, the effectiveness of using COMSOL two-dimensional (2D) simulation to solve the problem is validated in conjunction with experimental results. Then three coating structure models are investigated. Finally, a coating with ultra-low reflectance in the entire visible wavelength band (380–780 nm) is designed. The coating has a novel structure consisting of resin-anchored double-layer unequal-size HSPs. It combines two anti-reflective principles, the moth-eye bionic structure and the refractive index adjustment of the film layer. The maximum reflectance of the coating is only 0.32 % over the entire visible wavelength range, and its average reflectance reaches an ultra-low level of 0.14 %. The coating has a wide angle anti-reflective performance. When the angle of incidence is <60°, the reflectance of the coating is <3 %. The results of this study are expected to provide direction for later experimental improvements.

A Bioinspired Bilevel Metamaterial for Multispectral Manipulation toward Visible, Multi-Wavelength Detection Lasers and Mid-Infrared Selective Radiation.

Manipulation of the electromagnetic signature in multiple wavebands is necessary and effective in civil and industrial applications. However, the integration of multispectral requirements, particularly for the bands with comparable wavelengths, challenges the design and fabrication of current compatible metamaterials. Here, a bioinspired bilevel metamaterial is proposed for multispectral manipulation involving visible, multi-wavelength detection lasers and mid-infrared (MIR), along with radiative cooling. The metamaterial, consisting of dual-deck Pt disks and a SiO2 intermediate layer, is inspired by the broadband reflection splitting effect found in butterfly scales and achieves ultralow specular reflectance (average of 0.013) over the entire 0.8-1.6µm with large scattering angles. Meanwhile, tunable visible reflection and selective dual absorption peaks in MIR can be simultaneously realized, providing structural color, effective radiative thermal dissipation at 5-8µm and 10.6µm laser absorption. The metamaterial is fabricated by a low-cost colloidal lithography method combined with two patterning processes. Multispectral manipulation performances are experimentally demonstrated and a significant apparent temperature drop (maximum of 15.7°C) compared to the reference is observed under a thermal imager. This work achieves optical response in multiple wavebands and provides a valuable way to effectively design multifunctional metamaterials inspired by nature.

Homogeneous Nanostructured VO2@SiO2 as an Anti-Reflecting Layer in the Visible/Near Infrared Wavelength.

Low reflectivity is of great significance to photoelectric devices, optical displays, solar cells, photocatalysis and other fields. In this paper, vanadium oxide is deposited on pattern SiO2 via atomic layer deposition and then annealed to characterize and analyze the anti-reflection effect. Scanning electron microscope (SEM) images indicate that the as-deposited VOx film has the advantages of uniformity and controllability. After annealing treatment, the VO2@pattern SiO2 has fewer crevices compared with VO2 on the accompanied planar SiO2 substrate. Raman results show that there is tiny homogeneous stress in the VO2 deposited on pattern SiO2, which dilutes the shrinkage behavior of the crystallization process. The optical reflection spectra indicate that the as-deposited VOx@pattern SiO2 has an anti-reflection effect due to the combined mechanism of the trapping effect and the effective medium theory. After annealing treatment, the weighted average reflectance diminished to 1.46% in the visible near-infrared wavelength range of 650-1355 nm, in which the absolute reflectance is less than 2%. Due to the multiple scattering effect caused by the tiny cracks generated through annealing, the anti-reflection effect of VO2@pattern SiO2 is superior to that of VOx@pattern SiO2. The ultra-low reflection frequency domain amounts to 705 nm, and the lowest absolute reflectance emerges at 1000 nm with an astonishing value of 0.86%. The prepared anti-reflective materials have significant application prospects in the field of intelligent optoelectronic devices due to the controllability of atomic layer deposition (ALD) and phase transition characteristics of VO2.