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Molecularly imprinted photonic hydrogel sensor for optical detection of L-histidine
摘要： A molecularly imprinted photonic hydrogel (MIPH) is described for the optical determination of L-histidine (L-His). The inverse opal structure of MIPH was obtained by placing silica particles (230 nm) in molecularly imprinted polymer on a glass slide. After being fully etched by hydrofluoric acid, this inverse opal structure brings about a high specific surface and plentiful binding sites for L-His. If L-His is absorbed by the modified MIPH, its average effective refraction coefficient is increased. This causes the Bragg diffraction peak to be red-shifted by about 34 nm as the concentration of L-His increases from 0 to 100 nM. Much smaller diffraction peak shifts are obtained for other amino acids. The detection limit of this method is 10 pM. The response time towards L-His is as short as 60 s. In addition, the sensor can be recovered by treatment with 0.1 M acetic acid/methanol. It was applied to the determination of L-His in drinks sample.
关键词： Inverse opal structure,St?ber method,Nanoporous materials,Photonic crystal array,UV curing,Bragg diffraction peak,Hydrogen bonding,Reflection spectrum
更新于2025-09-10 09:29:36
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Numerical investigation and analysis of flattened dispersion for supercontinuum generation at very low power using Hexagonal shaped Photonic crystal fiber (H-PCF)
摘要： In this work, we report a design of hexagonal photonic crystal fiber (PCF) with eight hexagonal rings with modified air hole size at the innermost ring. We analyze and compare the major optical parameters of a PCF such as dispersion and nonlinearity over the span of wavelength ranges from 800 nm to 1600 nm at different core diameters. The designs exhibit a high nonlinearity of 220 W-1 km-1 at 800 nm for supercontinuum generation in designed PCF and along the dispersion in negative characteristics about ?650 ps/nm.km at 1310 nm with two zero dispersion wavelengths at 864 nm and at 1484 nm are numerically studied. In addition, we investigate the numerical modeling of supercontinuum (SC) generation in the designed PCFs and nearly 600 nm using 50 fs pulse with 2 kW pump power at 800 nm spectrum have been observed.
关键词： Soliton pulse,Supercontinuum generation,Photonic crystal fiber,Nonlinear Schr?dinger equation,Two zero dispersion wavelength
更新于2025-09-10 09:29:36
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Enhanced sensitivity of hemoglobin sensor using dual-core photonic crystal fiber
摘要： A Hemoglobin (Hb) biosensor based on dual-core photonic crystal fiber is proposed and analyzed. In this paper, the effective refractive index dependency on the Hb concentration within a blood sample is utilized in obtaining the transmission spectrum variation. The results are calculated using full vectorial finite element method. Through this study, the effect of the structure geometrical parameters on the sensor performance is optimized to maximize the sensor sensitivity. The numerical results show a sensitivity of 8.013 nm/g/dL for the X-polarized mode at 3.7 cm fiber length and 7.68 nm/g/dL for the Y-polarized mode at 3.2 cm fiber length of the proposed sensor.
关键词： Coupling length,Finite element method,Transmission spectrum,Dual-core photonic crystal fiber,Hemoglobin concentration
更新于2025-09-10 09:29:36
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A tunable broadband filter of ternary photonic crystal containing plasma and superconducting material
摘要： This work reports the optical properties of a one-dimensional (1D) ternary periodic structure composed of a dielectric, magnetized cold plasma (MCP) and superconducting material by using well-known simple transfer matrix method. The MCP has considered right-hand and left-hand polarizations having positive (? B) and negative (- B) transverse magnetic ?eld, respectively. The transmittance of the ternary photonic crystals is analyzed by varying the angle of incidence, the magnetic ?eld, the electron density of the magnetized cold plasma, the temperature of the superconductor, the thickness of magnetized cold plasma and superconducting material for the right-hand and left-hand polarization structures. The transmittance of the ternary photonic crystal containing dielectric, magnetized cold plasma and superconducting material has tunable broadband and narrowband ?lters for the left-hand and right-hand polarizations, respectively. The magnetized cold plasma layer in the ternary photonic crystal also played an important role to form the tunable gap due to the transverse magnetic ?eld. The analysis of the transmittance of the ternary photonic crystal containing dielectric, magnetized cold plasma and superconducting materials has shown an innovative idea for the formation of the tunable broadband and the narrowband ?lters.
关键词： 1D ternary photonic crystal,Magnetized cold plasma,Tunable broadband and narrowband ?lters,Superconducting material
更新于2025-09-10 09:29:36
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Temperature sensor utilizing a ternary photonic crystal with a polymer layer sandwiched between Si and SiO2 layers
摘要： Recently, one-dimensional periodic ternary photonic crystals have shown outstanding properties when compared to one-dimensional periodic binary photonic crystals. In this work, a ternary photonic crystal is proposed as a temperature sensor. The structure of the ternary photonic structure is considered Si/polymer/SiO2. The transmission spectra of the proposed ternary photonic structure are studied for different temperatures. It is observed that as the temperature increases, the transmission peak shifts toward higher wavelengths due to thermo-optic and thermal expansion coefficients of the polymer. It is found that the temperature-sensitive transmission peak shift is considerably enhanced due to the insertion of the polymer layer between Si and SiO2 to constitute a ternary photonic crystal.
关键词： Temperature sensor,Polymers,Ternary photonic crystal
更新于2025-09-10 09:29:36
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Applied magnetic field effect on core mode properties of MFPCF
摘要： The work investigates a magnetic ?uid ?lled photonic crystal ?bre (MFPCF) at 1557 nm under applied magnetic ?eld. They computed the refractive index change of the MF due to the magnetic ?eld and used it in simulations to ?nd the effective refractive indices of the core and the ?rst cladding modes of the MFPCF. Then, they analytically computed the effective mode area and the con?nement loss. The effective refraction index of the core mode increasing by 0.0341% under the applied ?eld of 0–500 Oe, increases the effective mode area by 128% and the con?nement loss by 866%. Thus, a rather small change in the effective refractive index gives rise to a rather large change in con?nement loss. However, this effect saturates after about 500 Oe because the MF nanoparticles no longer change their magnetic orientation. It is also noteworthy that the con?nement loss changes almost linearly with the effective area as the magnetic ?eld change. These results suggest that MFPCF are suitable for a tunable attenuator and a ?eld sensor.
关键词： con?nement loss,effective mode area,photonic crystal ?bre,refractive index,magnetic ?uid
更新于2025-09-10 09:29:36
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Realization of absorber, reflector and transmitter using single photonic structure
摘要： The present communication deals with a metamaterial based single photonic crystal fiber (PCF) to realize absorber, reflector, and transmitter application. The simulation studies which is made with the help of plane wave expansion method infers that the configuration including lattice spacing and diameter of air holes of the photonic crystal fiber along with the nature of the material play an important role to realize the aforementioned applications. Furthermore, the novelty of this work is that single PCF structure bestows absorber, reflector, and transmitter
关键词： transmitter,Meta-material,absorber,photonic crystal fiber,reflector
更新于2025-09-10 09:29:36
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Influences of Asymmetrical Geometric Structures on the Birefringence of Index-Guiding Photonic Crystal Fiber
摘要： We have numerically investigated the influences of asymmetrical geometric structures on the birefringence of the index-guiding photonic crystal fiber (IG-PCF), by the finite element method. The structure of a reported highly birefringent (HB) PCF with artificial defect in the core is modified to destruct the symmetry. Our proposed structural modifications include elliptical air hole cladding, squeezing lattice of air holes, rotational elliptical air holes, and horizontally shifted air holes, in the cladding. It is found that the birefringence is sensitive to the modifications in different cases due to the different mechanisms. For 1550 nm wavelength, the optimized birefringence can be obtained to be 0.0328 by the elliptical air holes with the major semi-axis in the direction of the long side of the rectangular core region. Furthermore, for the HB-PCF by the asymmetric core shape, the structural factor restricting the further increase of birefringence is that continuous increase of asymmetry leading to the multi-core transmission. It seems to be that This work is not only a proposing of the optimal design of HB-PCF, but also a reference of founding the essence of geometric birefringence.
关键词： structural anisotropy,high birefringence,polarization-maintaining fiber,Photonic crystal fiber (PCF),geometric birefringence
更新于2025-09-10 09:29:36
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Self-energy shift of the energy levels of atomic hydrogen in photonic crystal medium
摘要： Corrections to the average kinetic energy of atomic electrons caused by the change in electron mass in the photonic crystal medium are investigated. Corresponding shift of energy levels of atoms placed in a photonic crystal is shown to be of order of the ordinary Lamb shift.
关键词： atomic hydrogen,photonic crystal,energy levels,Lamb shift,quantum electrodynamics
更新于2025-09-10 09:29:36
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Tuning of the defect mode in a 1D superconductor-semiconductor crystal with hydrostatic pressure dependent frequency of the transverse optical phonons
摘要： This study aims to investigate a transmittance spectrum in a one-dimensional photonic crystal, which is surrounded by air and composed of alternating layers of a superconductor (HgBa2Ca2Cu3O8+δ) and a semiconductor (GaAs), using the transfer matrix and two-fluid models. Herein, we considered the pressure-dependence of the superconductor’s critical temperature and the pressure-dependence, in the semiconductor, in both the angular frequency of the transverse optical phonons and the thickness of layers. Initially, we found that increasing the pressure for fixed thickness values of the superconductor results in a shift in the larger frequencies of the transmittance spectrum and the photonic band gaps. With an increase in the thickness of the superconductor layer at a fixed pressure and thickness values of the semiconductor, an increase in the width of the photonic band gaps was observed. When a defective GaAs semiconductor layer was inserted into the structure due to the dissipative features of the semi-conductor, a defective mode with a transmittance of less than 1.0 was found inside the photonic band gaps. When the thickness of the superconductor layer was increased, while keeping the pressure and thickness of the semiconductor constant, the defect mode shifted to shorter frequencies. It was also found that the shift and the number of defective modes in the photonic band gaps increase when the thickness of the defective semiconductor layer increases.
关键词： superconductor,transfer-matrix method,semiconductor,defect mode,Photonic crystal
更新于2025-09-10 09:29:36