Optical Absorption Characteristics Research Articles

Local structure, spectroscopy and luminescence of the Li2B4O7:Cu,Eu glass

The Li2B4O7:Cu,Eu glass containing 1.0 mol.% CuO and Eu2O3 impurities was obtained and studied by XRD, EPR, optical absorption, and photoluminescence techniques. Parameters of local structure (interatomic distances and coordination numbers) were derived from XRD data analysis. The EPR and optical absorption, emission, photoluminescence excitation show that the Cu impurity is incorporated into the Li2B4O7 glass as Cu2+ (3d9) and Cu+ (3d10) ions. The Cu2+ ions in Li2B4O7:Cu,Eu glass show characteristic EPR and optical absorption spectra. Spin Hamiltonian parameters of the Cu2+ EPR spectrum were determined. Optical absorption spectrum of the Li2B4O7:Cu,Eu glass was analysed and interpreted. Optical band gap and Urbach energy of the Li2B4O7:Cu,Eu glass were evaluated. Photoluminescence spectra of the Li2B4O7:Cu,Eu glass reveal broad blue emission band of Cu+ (3d94s1 → 3d10 transition) and narrow emission bands of Eu3+ (4f6) ions belonging to the 5D0 → 7FJ (J = 0 – 4) transitions with characteristic decay kinetics.

Structural and surface functionalized L-tyrosine Iron Oxide (L-tyr-Fe) nanoparticles for antimicrobial impacts

Bacterial resistance results from changes in the ability of microorganisms to withstand antibacterial medicines, which can either render them inactive or reduce their therapeutic efficiency. This results in prolonged infection periods, elevated mortality rates and increased financial strain on healthcare systems. However, iron oxide nanoparticles (Fe NPs) have been explored as a potential candidate to improve the therapeutic and physicochemical activities among the studied metal-oxides due to their exceptional structural, optical, surface and magnetic impacts. The major goal of this research was to design the surface of Fe NPs by co-precipitating them with L-tyrosine (L-tyr-Fe NPs), improving their antimicrobial activity. UV–Vis spectrophotometry showed a characteristic optical absorption at 391 nm for the L-tyr-Fe NPs and 262 nm for pure iron oxide. The surface functionalized L-tyrosine (L-tyr-Fe NPs) was investigated by its vibrational frequencies using Fourier Transform Infrared (FTIR) spectrophotometry. The crystal phase and sizes of the L-tyr-Fe NPs were estimated using X-ray diffractometry (XRD), which revealed crystalline cubic diameters of 33.50 and 12.87 nm for the Fe NPs and L-tyr-Fe NPs, respectively. The particle size of the L-tyr-Fe NPs was 11.8 nm, confirmed by high-resolution transmission electron microscopy (HR-TEM). A DLS study revealed the monodispersed nature of the L-tyr-Fe NPs (polydispersity index, 0.314). The stable nature of the L-tyr-Fe Nps was checked by zeta potential measurements (zeta value −20.14 mV). The bioassay of L-tyr-Fe Nps showed comparable or better results against Escherichia coli and Bacillus subtilis as compared with common antibiotics. The L-tyr-Fe Nps at 150μg/mL showed an effective zone of inhibition of 15 ± 0.00 mm against Bacillus subtilis, which was comparable to streptomycin (16 ± 0.0 mm at 150μg/mL), amoxicillin (16 ± 0.0 mm at 150μg/mL) and chloramphenicol (16 ± 0.0 mm at 100μg/mL) and better than ampicillin (11 ± 0.0 mm at 150μg/mL) for Bacillus subtilis An inhibition zone of 22.66 ± 0.03 mm at 200 μg/mL was observed against Escherichia coli, which was better than streptomycin (17 ± 0.0 mm at 100μg/mL), ampicillin (18.5 ± 0.0 mm at 150μg/mL) and chloramphenicol (17 ± 0.0 mm at 150μg/mL). These discoveries could eventually be exploited to develop novel therapeutic approaches that may use nano-bio conjugates. Such amino acid-coated iron oxide materials are appreciated in the field of medical sciences and technologies. The surface modified iron oxides (Fe3O4) NPs formed using eco-friendly and cost-effective method were found to be potent biomaterials that can be used as antimicrobial agents for Gram-positive and Gram-negative bacteria with multiple antibiotic resistances.

Optical properties of borate glasses containing chromium and erbium oxide

Borate glass samples containing chromium and erbium were prepared. According to the density and molar volume, the Cr2O3-free glass sample had an expanded glass structure. Cr has three distinct absorption bands, and according to the measured optical absorption characteristics, a band was observed at 688 nm due to the 4A2g(F) → 2Eg(G) transition, indicating the presence of Cr6+. Cr3+ was observed in the bands at 446 and 620 nm, which were attributed to 4A2g (F) → 4T2g (F) and 4A2g (F) → 4T1g (F). Using the absorption spectra of the glass samples, the Judd–Ofelt theory was used to calculate the three parameters for glass: Ω2, Ω4, and Ω6. The slow transformation of chromium ions in these glasses from Cr6+ to Cr3+ disturbs the local symmetry and adds coordinated bond defects, which affect the surroundings of Er3+ ions.

Decoupling absorption and radiative cooling in mid-wave infrared bolometric elements.

We present a spectrally selective, passively cooled mid-wave infrared bolometric absorber engineered to spatially and spectrally decouple infrared absorption and thermal emission. The structure leverages an antenna-coupled metal-insulator-metal resonance for mid-wave infrared normal incidence photon absorption and a long-wave infrared optical phonon absorption feature, aligned closer to peak room temperature thermal emission. The phonon-mediated resonant absorption enables a strong long-wave infrared thermal emission feature limited to grazing angles, leaving the mid-wave infrared absorption feature undisturbed. The two independently controlled absorption/emission phenomena demonstrate decoupling of the photon detection mechanism from radiative cooling and offer a new design approach enabling ultra-thin, passively cooled mid-wave infrared bolometers.

Antiplatelet Action of Chloramine Derivatives of Adenosine Phosphates and Their Chemical Activity in Relation to Sulfur-Containing Compounds.

We studied the properties of N6-chloroadenosine phosphates (ATP, ADP, and AMP chloramines) as compounds with potentially increased antiplatelet efficacy determined by their binding to the plasma membrane of platelets. Chloramine derivatives of ATP, ADP, and AMP do not differ in their optical absorption characteristics: their absorption spectra are in the range of 220-340 nm with a maximum at 264 nm. Chloramines of adenosine phosphates are characterized by high reactivity with respect to thiol compounds. In particular, the rate constants of the reaction of N6-chloroadenosine-5'-diphosphate with N-acetylcysteine, reduced glutathione, dithiothreitol, and cysteine reach 59,000, 250,000, 340,000, and 1,250,000 M-1×sec-1, respectively, and only 1.10±0.02 M-1×sec-1 with methionine. It has been found that N6-chloradenosine-5'-triphosphate is a strong inhibitor of platelet functions: it effectively suppresses ADP-induced cell aggregation (IC50 in the whole blood is 5 μM) and inhibits aggregation of preactivated platelets and induces dissociation of their aggregates.

A non-invasive optical method for anaemia detection

The latest non-invasive biomedical electronic sensors are capable of providing continuous reliable information, for instance oxygenation level of blood, level of glucose etc. These biomedical sensors are in general based on the electro-chemical or spectral properties of the substances. The absorption of blood in infrared and visible range is prominently determined by haemoglobin. The coefficient of absorption for blood is different at different wavelengths. This optical absorption characteristic of the blood yields the vital information on the composition of the blood. Haemoglobin is primarily used to measure the status of anaemia, in developing countries like India and other African countries numerous people with greater health needs don’t have access to proper diagnostic facilities. Therefore, an introduction of portable, low cost and non-invasive Haemoglobin detector will give a vast opportunity for screening the population suffering with anaemia. The present article purposes a non-invasive method of haemoglobin detection comprising of an organic photovoltaic cell and three LED’s sources i.e., blue, green and red which are used with their respective radiation spectral range of 450–495 nm, 495–570 nm and 620–750 nm to illuminate an area of the skin on finger, this transmitted light after interacting with tissues is detected by an arrangement of Coumarin 30 : C60/NN′-QA/ZnPc active layer based organic solar cell. Thus, the approach provide in this article presents a simple, biocompatible and flexible means for assessing blood haemoglobin level by utilizing an multi spectral optical processing method. The method developed herein could further be integrated to wearable electronic devices.

Metal atoms adsorbed Ga2O3 monolayer: As a potential application in optoelectronic devices

Density functional theory based on first principles has been used to analyze the electronic, magnetic, work function, and optical absorption characteristics of metal atoms adsorbed Ga2O3 monolayer structures. The outcomes demonstrate that the Pt–Ga2O3 and Zn–Ga2O3 systems remain nonmagnetic semiconductor characteristics, while the Ag–Ga2O3, K–Ga2O3, Li–Ga2O3 and Na–Ga2O3 systems exhibit nonmagnetic metal behaviors. Meanwhile, the Al–Ga2O3, Cr–Ga2O3, Fe–Ga2O3 and Ni–Ga2O3 systems reveal magnetic metal behaviors, and the Au–Ga2O3, Bi–Ga2O3, Ge–Ga2O3 and Sn–Ga2O3 systems show magnetic semiconductor characteristics. Whereas the Co–Ga2O3 system emerges magnetic semimetal behavior. Furthermore, the work function of Ga2O3 adsorbed by metals are reduced. Importantly, after the adsorption of metal atoms, the optical absorption of Ga2O3 systems has been improved to varying degrees in the visible and infrared regions, and many absorption peaks have appeared, indicating that the introduction of metal atoms can improve the optical absorption of the Ga2O3 systems in both visible and near-infrared regions. Moreover, spherical metal nanoparticles placed on top of Ga2O3 nanosheets can excite localized surface plasmon resonance, which will greatly enhance the absorption properties of the structure. Therefore, the above results suggest that the metal atoms adsorbed Ga2O3 systems will be useful for the fabrication of spintronics, field emission devices and solar photovoltaic devices.

2D Saturable Absorbers for Potential Pulse Generation in the Visible-Wavelength Band

Implementing compact, efficient, and reliable passive pulsed lasers at visible wavelengths is attractive. This paper systematically investigated the thickness-dependent optical absorption characteristics of two-dimensional materials, including graphene, transition-metal dichalcogenides, and dye films at the 532 nm wavelength band, and revealed the effects of thickness on different optical absorption parameters. The results suggested that dye films are more suitable for loss-sensitive pulsed lasers and graphene is more suitable for modulation depth-sensitive pulsed lasers, while transition-metal dichalcogenide samples have intermediate performance. It can provide guidance for the rational selection of saturable absorbers in pulsed all-fiber lasers to optimize the optical pulse performance in the visible-wavelength band.

Vertex‐Shared Linear Superatomic Molecules: Stepping Stones to Novel Materials Composed of Noble Metal Clusters

Extremely small metal clusters composed of noble metal atoms (M) have orbitals similar to those of atoms and therefore can be thought of as artificial atoms or superatoms. If these superatoms can be assembled into molecular analogs, it might be possible to create materials with new characteristics and properties that are different from those of existing substances. Therefore, the concept of superatomic molecules has attracted significant attention. The present review focuses on vertex‐shared linear M12n+1 superatomic molecules formed via the sharing of a single metal atom between M13 superatoms having icosahedral cores and summarizes the knowledge obtained to date in this regard. This summary discusses the most suitable ligand combinations for the synthesis of M12n+1 superatomic molecules along with the valence electron numbers, stability, optical absorption characteristics, and luminescence properties of the M12n+1 superatomic molecules fabricated to date. This information is expected to assist in the production of many M12n+1 superatomic molecules with novel structures and physicochemical properties in the future.

Non-uniform image reconstruction for fast photoacoustic microscopy of histology imaging.

Photoacoustic microscopic imaging utilizes the characteristic optical absorption properties of pigmented materials in tissues to enable label-free observation of fine morphological and structural features. Since DNA/RNA can strongly absorb ultraviolet light, ultraviolet photoacoustic microscopy can highlight the cell nucleus without complicated sample preparations such as staining, which is comparable to the standard pathological images. Further improvements in the imaging acquisition speed are critical to advancing the clinical translation of photoacoustic histology imaging technology. However, improving the imaging speed with additional hardware is hampered by considerable costs and complex design. In this work, considering heavy redundancy in the biological photoacoustic images that overconsume the computing power, we propose an image reconstruction framework called non-uniform image reconstruction (NFSR), which exploits an object detection network to reconstruct low-sampled photoacoustic histology images into high-resolution images. The sampling speed of photoacoustic histology imaging is significantly improved, saving 90% of the time cost. Furthermore, NFSR focuses on the reconstruction of the region of interest while maintaining high PSNR and SSIM evaluation indicators of more than 99% but reducing the overall computation by 60%.

Structural and optical exploration of promising zinc (8-hydroxyquinoline) thin films for wide-scale optoelectronic applications

This research presents a detailed sequential study of the thickness effect on structural, morphological, and optical properties of vacuum thermally deposited zinc 8-hydroxyquinoline (ZnQ2) thin films. The FTIR results demonstrate that ZnQ2's molecular structure has a high degree of stabilization. On the other hand, the change in thickness affects the film's roughness. The film roughness decreases to 2.398 nm as the film thickness increase to 143 nm, and then roughness increases again at a thickness of 185 nm. The optical absorption features of the prepared films are explained. The optical energy gap has been calculated and found to be in the range of (2.79–2.87) eV. Furthermore, the refractive index dispersion has been analyzed. ZnQ2 thin film of thickness 87 nm achieved the highest linear optical susceptibility, nonlinear optical susceptibility, and nonlinear refractive index. The high peak located at photon energy 4.4 eV assures the validity of the material's proposal for optical switching applications. Besides, compared to many other organic complexes, ZnQ2 is a highly recommended candidate for efficient organic optoelectronic and optical switching applications.

Effects of geometric parameters on optical absorption characteristics of InGaN nanostructured arrays

In recent years, with the development of wide-spectrum response photodetectors, InGaN as a semiconducting material has been widely studied. The nanowire array structure has excellent trapping ability, but different structures and shapes have different absorption abilities. It is necessary to optimize the nanowire array continuously in order to obtain the highest absorption efficiency possible. Based on this background, we study the effects of the geometry and structural parameters of InGaN nanowires on the optical response properties. We define the cone ratio and fill factor, respectively, and compare the optical absorption characteristics of InGaN nanowires by using the finite difference time domain (FDTD) method. The calculation results show that the truncated nanocone arrays can enhance the light capture ability and obtain the high sensitivity of the cut-off wavelength. Its optical absorption is at least 15% higher than that of nanowires. Therefore, the research of this paper can provide a certain theoretical reference for the experiment and preparation of InGaN photocathode.

Synthesis of the cerium doped Gd3Al3Ga2O12-based glass nanoceramics: Luminescence and optical absorption properties

Cerium doped gadolinium gallium aluminum garnet (Gd3Al3Ga2O12, GAGG) was synthesized in the glass ceramics form by the crystallization from Gd2O3–Al2O3–Ga2O3–SiO2–CeO2 glass in the following weight proportion: 101 : 26: 47 : 25: 1. The spatial distribution and incorporation of Ce into the GAGG ceramic grains as well as the luminescence and scintillation performance are studied carrying out correlated experiments of photo-, radio- and cathodoluminescence including decay kinetics as well as energy dispersive X-ray spectroscopy combined with scanning electron microscopy. Optical absorption features were investigated using photothermal deflection spectroscopy. Cerium stays within the material mostly in the Ce3+ charge state. Its distribution in the bulk of the sample exhibits irregular trend indicating the tendency to coalesce in the middle.

Structural, optical and radiation shielding parameters of sodium aluminium borate glasses modified with chromium oxide

Samples of nominal composition xCr2O3. (60-x)B2O3.5Al2O3.35Na2O: x = 0 (Cr0), 0.1 (Cr0.1), 0.2 (Cr0.2), 0.4 (Cr0.4), 0.6 (Cr0.6), 0.8 (Cr0.8), and 1 (Cr1) mol% were prepared via the traditional melt quenching route. Structural FTIR absorption spectra of the prepared glasses reveal distinct absorption bands which are characteristic of both triangular BO3 and tetrahedral BO4 groups within their varying wavenumber vibrational sites. The dopant chromium ions are observed to have no distinct variations on the FTIR spectra because of low dopant percent. Optical absorption characterization indicates that the undoped glass shows only UV absorption which is related to originating from unavoidable trace ferric ions present as impurities in the used chemicals. The Cr2O3-doped glasses reveal additional UV absorption at about 370-385 nm correlated with the hexavalent state of chromium, producing this distinct charge transfer band. Additionally, two visible bands are identified at about 420-400 nm and 580-640 nm originating from trivalent chromium ions with distorted octahedral coordination. Optical parameters including band gap, refractive index, molar refraction, and reflection losses were calculated together with optical dielectric properties, electronic and molar polarizability. In terms of radiation shielding capacity, increasing Cr2O3 mol% of the sample encoded Cr1 that possessed the highest mass (μm) and linear (μ) attenuation coefficients, but the lowest half value layer (HVL) at low and high incident photon energy, results showed that Cr1 can be used in optical and radiation shielding safety.

NIR emissions from Nd3+-activated phosphate-based glass system for cost-effective, tunable, and miniaturised laser devices

This work represents a phosphate-based glass system of composition (40-x) P2O5 − 30 B2O3 − 30 ZnSO4 - x Nd2O3, ( × = 0.5, 1.0, 1.5, 2.0 and 2.5 mol%) to determine the optical absorption and emission spectral characteristics. Moreover, Judd-Ofelt (J-O) intensity and radiative parameters were computed. Samples were prepared using melt-quenching method and characterized using Archimedes measurement, Ultraviolet–Visible-Near Infrared Spectroscopy and Photoluminescence Spectroscopy. The density values of these samples were reduced as the Nd2O3 concentration increased. The absorption spectra revealed 11 peaks corresponded to Nd3+ transitions from the lowest electronic energy level (4I9/2) to various excited levels. The optical energy band gap was found to be reduced with Nd3+ doping. The refractive indices (n) increased as the Nd3+ increase. The improving tendency of n was clarified in terms of the enhancing trend of samples molar volume (obtained from density), indicating a structural-optical correlation in the proposed glass system. The obtained values of Urbach energy (Eu) have an increasing trend in the range of ∼ 0.318–0.711 eV. Tow significant NIR emission peaks were assigned to the 4F5/2 → 4I9/2 and 4F3/2 → 4I9/2 transitions of Nd3+. Values of J-O intensity parameters Ω2, Ω4 and Ω6 were found in the range of (1.63–2.25)× 10−19 cm2, (2.57–2.94)× 10−19 cm2 and (1.53–1.82)× 10−19 cm2, respectively. The obtained stimulated emission cross-section for the NIR transitions from Nd3+ ((23.83–26.64)× 10−20 cm2 for 4F5/2 → 4I9/2, and (10.93–17.91)× 10−20 cm2 for 4F3/2 → 4I9/2 obviously revealed the lasing effectiveness of the titled glass system.

Benzyl Alcohol Photo-oxidation Based on Molecular Electronic Transitions in Metal Halide Perovskites

Vacancy ordered double perovskites Cs2Te(IV)X6 have been found to exhibit molecule-like electronic behavior when X is Cl– or Br– due to the zero-dimensional (0D) nature of their octahedral units. Electronically isolated building blocks, the [TeBr6]2– ionic octahedron, serve as the fundamental electronic unit of the Cs2TeBr6 solid. Herein, a detailed understanding of the Cs2TeBr6 electronic structure and its photoexcitation is presented with consideration of individual molecular orbitals from these isolated octahedral building blocks. Two optical absorption features correspond to two unique electronic transitions, (1) a highest occupied molecular orbital (HOMO) to lowest unoccupied molecular orbital (LUMO) transition under 455 nm excitation and (2) mixed transitions including lower HOMO states to LUMO transition and HOMO to higher LUMO states transition under 365 nm excitation. With this in mind, we examined the excitation wavelength-dependent photo-oxidation of benzyl alcohol using Cs2TeBr6 as the photocatalyst. Significant differences in photocatalytic performance were observed, and different forms of activated alcohol radicals were detected under the two excitation wavelengths. As a case study, this work highlights the application of molecule-like halide perovskites in photocatalysis. The highly tunable energy band structures and catalytic centers in perovskites can offer a valuable platform for photocatalytic mechanistic studies and catalyst development in the foreseeable future.

Electrically Conductive Carbazole and Thienoisoindigo-Based COFs Showing Fast and Stable Electrochromism.

Thienothiophene thienoisoindigo (ttTII)-based covalent organic frameworks (COFs) have been shown to offer low band gaps and intriguing optical and electrochromic properties. So far, only one tetragonal thienothiophene thienoisoindigo-based COF has been reported showing stable and fast electrochromism and good coloration efficiencies. We have developed two novel COFs using this versatile and nearly linear ttTII building block in a tetragonal and a hexagonal framework geometry to demonstrate their attractive features for optoelectronic applications of thienoisoindigo-based COFs. Both COFs exhibit good electrical conductivities, show promising optical absorption features, are redox-active, and exhibit a strong electrochromic behavior when applying an external electrical stimulus, shifting the optical absorption even farther into the NIR region of the electromagnetic spectrum and achieving absorbance changes of up to 2.5 OD. Cycle-stable cyclic voltammograms with distinct oxidation and reduction waves reveal excellent reversibility and electrochromic switching over 200 cycles and confirm the high stability of the frameworks. Furthermore, high coloration efficiencies in the NIR region and fast switching speeds for coloration/decoloration as fast as 0.75 s/0.37 s for the Cz-ttTII COF and 0.61 s/0.29 s for the TAPB-ttTII COF at 550 nm excitation were observed, outperforming many known electrochromic materials, and offering options for a great variety of applications, such as stimuli-responsive coatings, optical information processing, or thermal control.

Molecular γ-amino butyric acid and its crystals: Structural, electronic and optical properties

This work presents the formation of monoclinic γ-aminobutyric acid (GABA) crystals grown from an aqueous ethanol solution with the dimensions 4 ​× ​1 ​× ​0.6 ​mm3. The structural properties of the grown crystal were evaluated via X-ray diffraction analysis of the powder and single crystal, which confirmed a monoclinic crystal system with space group P21/c. Thermal stability and the melting point of the synthesized GABA crystal were investigated using TG-DSC measurements. We also characterized experimentally monoclinic and molecular GABA solvated in water, obtaining its optical absorption spectrum in the UV-VIS region. Time-dependent DFT calculations were performed for the GABA molecule in the neutral and zwitterion forms to understand their optical absorption features. Structural, electronic, and optical properties of four γ-aminobutyric acid (GABA) crystal polymorphs (monoclinic, tetragonal, hexagonal, and monohydrate) were achieved through DFT calculations employing a dispersion corrected exchange-correlation functional. Differences in the electronic and optical properties between polymorphs are discussed. We predict the GABA monoclinic crystal to be an indirect gap semiconductor with a gap value of 5.02 ​eV, in good agreement with our experimental measurements. Considering the other three polymorphs, their fundamental gap values range from 4.6 ​eV to 5.16 ​eV (being direct for all of them, except the monohydrate). The absorption spectra calculations reveal a significant optical anisotropy for all GABA crystals, with the highest optical absorption for the monoclinic structure in the 5–6 ​eV energy range.

Delafossite CuFeO2 nanosheets with highly exposed {0 0 1} crystal facets for enhancing charge separation efficiency

A series of CuFeO2 hexagonal nanosheets with different grain size were prepared by facile one-pot hydrothermal method through adjusting the synthesis conditions. The results of systematic analysis and characterization show that all the samples have a pure 3R-Delafossite phase, the same composition, the same optical absorption features, and the same hexagonal sheet morphology. However, the width and thickness of these nanosheets are different and can be distinguished. The results of photoelectrochemical tests demonstrate that CuFeO2 nanosheets with larger widths and smaller thickness have greater photocurrent densities. Therefore, the photocurrent density of CuFeO2 nanosheets with the largest aspect ratio (∼8 μA/cm2) is approximately six times higher than that of CuFeO2 nanosheets with the smallest aspect ratio (∼1.4 μA/cm2). The characterization results of SEM and TEM reveal that CuFeO2 nanosheets dominantly expose the {001} crystal facets. The results of DFT calculations unravel the (001) facet is a polar surface with strong built-in electric field. Thus, the larger the width of CuFeO2 nanosheets, the greater the contribution of polar facets. Moreover, the smaller its thickness, not only reduces the diffusion distance of photogenerated carriers, but also sharply increases the strength of the built-in electric field of polar facets.

Enhancement of optical absorption and dispersion characteristics of nanocrystalline In2Se3 films: impact of γ-ray irradiation

Thermal evaporation was used to deposit In2Se3 thin films with a thickness of 276 nm on different glass and quartz substrates under vacuum. The 60Co rays were used to irradiate thin films at dosages of 10, 20, 30, 40, and 50) kGy. X-ray Diffraction (XRD) and scanning electron microscopy (SEM) were used to investigate the crystalline and morphological structure of In2Se3 thin films, respectively. The results revealed that powder has a polycrystalline structure, whereas pristine and irradiated thin films are amorphous. The computed absorption coefficient indicates that direct transition is allowed for the as-deposited and γ-irradiated thin films, and the value of the measured energy gaps increases when the dose is increased from 10 to 50 kGy. Using single-oscillator models to obtain the dispersion parameters, the spectral dependency of the refractive index in the higher wavelength area was studied. The effect of irradiation on dielectric constants and dispersion characteristics suggests that the examined films are highly sensitive to appropriate irradiation dose. The nonlinear optical susceptibility has improved, making it appropriate for a variety of device applications.