研究目的
To numerically investigate a plasmonic absorber as a biosensor based on highly flexible electro-optic material for tunable sensing and filtering applications, with sensitivity to applied voltage, geometric parameters, and refractive index changes.
研究成果
The proposed electro-optic lithium niobate-based absorber exhibits high sensitivity and tunability for biosensing applications, with unity absorption at multiple resonant wavelengths. It offers advantages such as wide incident angle independence, polarization insensitivity, and the ability to reduce fabrication errors through voltage tuning, making it suitable for detecting various biomaterials and energy harvesting.
研究不足
The study is based on numerical simulations, not experimental validation, which may not account for real-world fabrication challenges or material imperfections. The tunability is dependent on applied voltage and material properties, potentially limiting practical applications if high voltages are required. The structure's performance might be affected by environmental factors not considered.
1：Experimental Design and Method Selection:
The study uses numerical simulations to design and analyze a cross-shaped parallel-rod (CSPR) perfect absorber structure. The design involves a unit cell with gold nanorods on a lithium niobate film backed by a gold reflector, utilizing the Pockels effect for electro-optic tunability. Simulations are performed to study absorption spectra, sensitivity, and field distributions.
2：Sample Selection and Data Sources:
The unit cell is a 400x400 nm square with geometric parameters such as rod length (l=300 nm), width (w=15 nm), spacing (s=20 nm), and thicknesses. Background materials include air (n=1.0) and various biomaterials with refractive indices from 1.333 to 1.
3：0) and various biomaterials with refractive indices from 333 to List of Experimental Equipment and Materials:
446.
3. List of Experimental Equipment and Materials: Gold (Drude model with plasma frequency 1.37e16 rad/s), lithium niobate (refractive index n=2.3, electro-optic coefficient γ=20 pm/V), PMMA for fabrication, and COMSOL Multiphysics software with RF module for simulations.
4：37e16 rad/s), lithium niobate (refractive index n=3, electro-optic coefficient γ=20 pm/V), PMMA for fabrication, and COMSOL Multiphysics software with RF module for simulations.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The structure is illuminated with x-polarized light. Absorption spectra are calculated by varying geometric parameters (length, space), incident angle, applied voltage (0-160 V), and background refractive index. Surface charge distributions are analyzed to understand resonance modes.
5：Data Analysis Methods:
Sensitivity (S=Δλ/Δn), figure-of-merit (FoM=S/FWHM), single-side quality factor (Q_ss), and relative sensitivity (S_r=(Δλ/λ)/ΔV_in) are calculated using simulation outputs.
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