研究目的
To design and investigate a novel low-temperature sensor based on symmetrical hybrid photonic crystals, specifically studying the temperature sensitivity of hybrid multilayers (F4/Bg5/F4) and (Bg5/F4/Bg5) using the two-fluid model and transfer matrix method, and to explore the effects of quasi-periodic sequences, superconductor thickness, and modulation parameters on sensitivity.
研究成果
The hybrid photonic crystal (F4/Bg5/F4) exhibits higher temperature sensitivity than (Bg5/F4/Bg5), with sensitivity up to 0.595 nm/°C for ds=50 nm and modulation parameters δ=6e-3, l=1e-4. Sensitivity is optimized by tuning modulation parameters and superconductor thickness, enabling the design of tunable low-temperature sensors. The findings confirm the potential of these structures in photonic sensor applications, with recommendations for future experimental verification and exploration of broader parameter ranges.
研究不足
The study is theoretical and numerical, lacking experimental validation. It assumes lossless materials (null extinction coefficients for SiO2 and Bi4Ge3O12, and lossless superconductor), which may not hold in practical scenarios. The thermo-optic effect is ignored for the superconductor layer. The range of parameters (e.g., temperature up to 90 K, specific modulation values) may limit generalizability.
1：Experimental Design and Method Selection:
The study uses theoretical models including the two-fluid model for superconductor properties and the transfer matrix method (TMM) to analyze optical transmittance. The design involves symmetrical hybrid photonic crystals with quasi-periodic Fibonacci sequences and Bragg mirrors.
2：Sample Selection and Data Sources:
The photonic crystals are composed of layers H (Bi4Ge3O12, nH=
3：13), L (SiO2, nL=45), and S (YaBO2CuO7 superconductor). Thicknesses are set with initial values:
dS=10 nm, dH=58.68 nm, dL=86.2 nm, and modulated using dj = d0 + j?δ with parameters δ and l.
4：68 nm, dL=2 nm, and modulated using dj = d0 + j?δ with parameters δ and l.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: No specific experimental equipment is mentioned as the study is numerical; materials include Bi4Ge3O12, SiO2, and YaBO2CuO
5：Experimental Procedures and Operational Workflow:
Numerical simulations are performed using TMM to calculate transmittance spectra. Parameters varied include temperature (10-90 K), superconductor thickness (ds=10, 30, 50 nm), and modulation parameters (δ, l). Light is incident normally from vacuum.
6：Data Analysis Methods:
Transmittance is calculated using TMM equations; defect mode positions and shifts are analyzed to determine temperature sensitivity. Comparisons are made with previous studies for validation.
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