One-Dimensional Photonic Research Articles

Arbitrary Polarization Conversion by the Photonic Band Gap of the One-Dimensional Photonic Crystal

Arbitrary Polarization Conversion by the Photonic Band Gap of the One-Dimensional Photonic Crystal

Optical Biosensor in a One-Dimensional Photonic Structure with Bound States in the Continuum

Optical Biosensor in a One-Dimensional Photonic Structure with Bound States in the Continuum

Sensing and Detection Capabilities of One-Dimensional Defective Photonic Crystal Suitable for Malaria Infection Diagnosis from Preliminary to Advanced Stage: Theoretical Study

In the present research work we have examined the biosensing capabilities of one-dimensional photonic crystals with defects for the detection and sensing of malaria infection in humans by investigating blood samples containing red blood cells. This theoretical scheme utilizes a transfer matrix formulation in addition to MATLAB software under normal incidence conditions. The purpose of considering normal incidence is to rule out the difficulties associated with oblique incidence. We have examined the performance of various structures of cavity layer thicknesses 1000 nm, 2200 nm, 3000 nm and 5000 nm. The comparison between the performances of various structures of different cavity thickness helps us to select the structure of particular cavity thicknesses giving optimum biosensing performance. Thus, the proper selection of cavity thickness is one of the most necessary requirements because it also decides how much volume of the blood sample has to be poured into the cavity to produce results of high accuracy. Moreover, the sensing and detection capabilities of the proposed design have been evaluated by examining the sensitivity, figure of merit and quality factor values of the design, corresponding to optimum cavity thickness.

Low-Temperature Stability and Sensing Performance of Mid-Infrared Bloch Surface Waves on a One-Dimensional Photonic Crystal.

The growing need for new and reliable surface sensing methods is arousing interest in the electromagnetic excitations of ultrathin films, i.e., to generate electromagnetic field distributions that resonantly interact with the most significant quasi-particles of condensed matter. In such a context, Bloch surface waves turned out to be a valid alternative to surface plasmon polaritons to implement high-sensitivity sensors in the visible spectral range. Only in the last few years, however, has their use been extended to infrared wavelengths, which represent a powerful tool for detecting and recognizing molecular species and crystalline structures. In this work, we demonstrate, by means of high-resolution reflectivity measurements, that a one-dimensional photonic crystal can sustain Bloch surface waves in the infrared spectral range from room temperature down to 10 K. To the best of our knowledge, this is the first demonstration of infrared Bloch surface waves at cryogenic temperatures. Furthermore, by exploiting the enhancement of the surface state and the high brilliance of infrared synchrotron radiation, we demonstrate that the proposed BSW-based sensor has a sensitivity on the order of 2.9 cm–1 for each nanometer-thick ice layer grown on its surface below 150 K. In conclusion, we believe that Bloch surface wave-based sensors are a valid new class of surface mode-based sensors for applications in materials science.

Transmission Spectra in One-dimensional Defective Photonic Crystal Integrating Metamaterial and Superconductor

Transmission Spectra in One-dimensional Defective Photonic Crystal Integrating Metamaterial and Superconductor

Properties of Defect Modes of One-Dimensional Quaternary Defective Photonic Crystal Nanostructure

Properties of Defect Modes of One-Dimensional Quaternary Defective Photonic Crystal Nanostructure

Bound States in the Continuum in a Dielectric Ridge on the Surface of a One-Dimensional Photonic Crystal

Bound States in the Continuum in a Dielectric Ridge on the Surface of a One-Dimensional Photonic Crystal

Efficient Optical Sensing Based on Phase Shift of Waves Supported by a One-Dimensional Photonic Crystal.

Interferometric methods of optical sensing based on the phase shift of the Bloch surface waves (BSWs) and guided waves (GWs) supported by a one-dimensional photonic crystal are presented. The photonic crystal, composed of six SiO2/TiO2 bilayers with a termination layer of TiO2, is employed in the Kretschmann configuration. Under resonance condition, an abrupt phase change is revealed, and the corresponding phase shift is measured by interferometric techniques applied in both the spectral and spatial domains. The spectral interferometric technique employing a birefringent quartz crystal is used to obtain interference of projections of p- and s-polarized light waves reflected from the photonic crystal. The phase shifts are retrieved by processing the spectral interferograms recorded for various values of relative humidity (RH) of air, giving the sensitivity to the RH as high as 0.029 rad/%RH and 0.012 rad/%RH for the BSW and GW, respectively. The spatial interferometric technique employs a Wollaston prism and an analyzer to generate an interference pattern, which is processed to retrieve the phase difference, and results are in good agreement with those obtained by sensing the phase shift in the spectral domain. In addition, from the derivative of the spectral phase shifts, the peak positions are obtained, and their changes with the RH give the sensitivities of 0.094 nm/%RH and 0.061 nm/%RH for the BSW and GW, respectively. These experimental results demonstrate an efficient optical sensing with a lot of applications in various research areas.

Manipulation of thermal radiation by using photonic crystals

This paper focuses on manipulating thermal emission and radiation loss of heat energy in a heat waveguide. A One-Dimensional Photonic Crystal is used as a waveguide clad to prohibit the thermal emission from escaping. The model may reduce the radiation loss of heat energy in the waveguide core, and heat energy can be confined to propagate along the waveguide’s longitude axis. The waveguide clad comprises alternative layers of high and low refractive index materials containing sufficient electromagnetic stop bands to trap the thermal emission from escaping out of the waveguide. The numerical simulation of the model shows that the forbidden bandgap of photonic crystal structures with alternative layers of silica and silicon has width enough to make heat energy be confined within the waveguide core so that efficient heat energy transmission can be achieved along the longitude axis of the waveguide.

Coherent Interactions in One-Dimensional Topological Photonic Systems and Their Applications in All-Optical Logic Operation.

Topological photonics has become an active subfield of photonics analogous to the electronic counterpart, and the bulk-edge correspondence leads to robust topologically protected interfacial states. However, a single-topological interface mode with fixed energy cannot be easily manipulated, hindering its applications in optical devices. Here, we study coupled-waveguide arrays mapped to a one-dimensional Su-Schrieffer-Heeger system with two coupled topological interfaces. This configuration greatly increases device versatility and tunability while keeping the confinement of coupled-interface modes inherited from the topological properties nearly intact. Theoretically predicted oscillations between coupled interfaces is experimentally observed. The spatial and energetic isolation of the coupled interface states from the bulk modes is experimentally observed and theoretically confirmed by calculating the degree of localization of the eigenstates, which is found to be comparable to a single-interface state. Finally, a proof-of-principle, all-optical logic circuit is fabricated based on coupled interfaces, demonstrating its potential in assembling on-chip topological optical devices.

Design of Flat Defects’ Band in One-Dimensional Coupled-Cavity Photonic Crystal Waveguides for Transmitting Ultrashort Pulses

In the present study, the transmission characteristics of ultrashort pulses through coupled-cavity waveguides in one-dimensional photonic crystals were investigated theoretically, using finite-difference time-domain and transfer matrix methods. By controlling the configuration of the waveguides, a flat defects’ band can be obtained in the transmission spectra, which can be used for passing ultrashort pulses. The conditions for achieving a flat defects’ band are derived by optimization geometrical parameters of the waveguides. The optimized structure is able to transmit ultrashort pulses, up to 30 fs, with negligible distortion and attenuation. Unlike the previously designed waveguides with the same application, we designed our system without using graded index materials or many thin film layers.

Design and analysis of omnidirectional solar spectrum reflector using one-dimensional photonic crystal

A one-dimensional photon crystal structure is proposed to design an omnidirectional broadband reflector. The structural parameters are optimized to reflect complete solar spectrum (0.3 to 2.3 μm) for both TE and TM polarized light. The design analysis is carried out using transfer matrix method. The structure is designed using alternate dielectric–dielectric layers of appropriate refractive indices and layer thicknesses. The proposed structure demonstrates more than 98% reflectivity for the complete wavelength range from 0.3 to 2.3 μm along with 73% emission in 8 to 13 μm, thus showing its potential as a dielectric-based reflector in applications such as daytime passive radiative coolers, and as a heliostat in concentrated solar power.

一维光子晶体槽型微环谐振器及其传感特性

一维光子晶体槽型微环谐振器及其传感特性

Research on Transmissivity and Defect Model of One-Dimensional Photon Crystals for Non-Vertical Incident

In this paper, we study the transmissivity of one-dimensional photonic crystals (PCs) for different incidence angles, and find that the band gaps become blue shift and the numbers of band gaps increase when the incidence angles increase. We study the position and thickness of defect layer effect on the transmissivity without absorption coefficient. Then we study the transmissivity characteristic by changing the absorption coefficient k, and find as the absorption coefficient increases, the defect model decreases and these effects characteristic have application value.

Effect of Uniaxial Strain on the Performance of One-Dimensional Graphene Fibonacci Photonic Crystal Biosensors

Many efforts have been made to improve efficiency of optical sensing devices to detect analyte and pathogens in highly diluted solutions. This paper reports on a study regarding the figure of merit of the optical sensors based on graphene quasi photonic crystals with Fibonacci sequences in different chemical potentials. We use transfer matrix method to find surface modes and calculate the sensitivity and full width at half-minimum of the resonance dip in the reflectance spectrum when graphene monolayers are under uniaxial strain. The strain not only changes the graphene electronic band structure, but also can be employed to tune the electrical properties of graphene monolayers. Results demonstrate that the performance of the proposed quasi periodic structures can be improved by adjusting the strain and the angle in which strain applied. In addition, our results show that the figure of merit enhances in Fibonacci structures with high sequences when chemical potential increases.

Чувствительный элемент на основе интегрально-оптического кольцевого резонатора и одномерного фотонного кристалла для датчиков физических величин

Чувствительный элемент на основе интегрально-оптического кольцевого резонатора и одномерного фотонного кристалла для датчиков физических величин

Absorption in One-Dimensional Lossy Photonic Crystal

Absorption in One-Dimensional Lossy Photonic Crystal

Ultrastrong Graphene Absorption Induced by One-Dimensional Parity-Time Symmetric Photonic Crystal

A novel microcavity structure based on 1-D parity-time (PT) symmetric photonic crystal (PC) is presented to get the embedded monolayer graphene absorption enhanced significantly, which paves a path to achieve ultrastrong, controllable, and anisotropic graphene absorption for incident eigenfrequency wave from near infrared to visible. When oscillation of absorption is at the center of the PT broken phase, because of exact matching usage of gain and loss modulation, and singular strong coupling effects that are induced by the PT symmetric PC behind graphene layer, ultrastrong and nonreciprocal graphene absorption can be obtained, and the maximum could reach the order of 10 5 . This approach offers a way to improve the responsivities of graphene-based optodetectors and even to the design of direction sensitive graphene optical communication components.

基于紧束缚理论的一维多镜像光子晶体特性研究

基于紧束缚理论的一维多镜像光子晶体特性研究

级联一维光子晶体全方位反射器的带宽最大化

级联一维光子晶体全方位反射器的带宽最大化