研究目的
Investigating the realization of redshift gaps in one-dimensional photonic crystals containing hyperbolic metamaterials for TM polarization and their application in high-efficiency wide-angle polarization selection.
研究成果
The study successfully demonstrates the realization of redshift gaps in 1DPCs containing HMMs for TM polarization, based on the anomalous wavevector dispersion of HMMs. The gaps remain blueshifted for TE polarization, enabling efficient wide-angle polarization selection. The highest polarization selection ratio reaches 27.6 at the incident angle of 70°. This work provides a novel physical mechanism for designing high-efficiency wide-angle polarization selectors.
研究不足
The long-wavelength gap edge does not exhibit a redshift property for TM polarization due to the narrow type-I HMM wavelength range of the fabricated sample. The absorptances for TM and TE polarizations are high due to the loss of Ag layers, making the transmittances low.
1：Experimental Design and Method Selection:
The study involves theoretical analysis and experimental verification of redshift gaps in 1DPCs containing HMMs and dielectrics. The HMM is mimicked by layered titanium dioxide and silver with a subwavelength unit cell.
2：Sample Selection and Data Sources:
The 1DPC sample is fabricated using an ion-assisted electron-beam evaporation process under high vacuum conditions. The re?ection spectra are measured by a Perkin Elmer LAMBDA 1050 ultraviolet-visible-near-infrared spectrophotometer.
3：List of Experimental Equipment and Materials:
The HMM layer is composed of titanium dioxide and silver films. The dielectric layer is TiO2. The sample is characterized using a Nova NanoSEM 450 for SEM imaging.
4：The sample is characterized using a Nova NanoSEM 450 for SEM imaging.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The sample is designed with specific thicknesses for the HMM and dielectric layers to achieve the desired redshift effect for TM polarization. The re?ection spectra are measured at different incident angles for both TM and TE polarizations.
5：Data Analysis Methods:
The shift of the gap edges with incident angle is analyzed to verify the redshift effect for TM polarization and the blueshift effect for TE polarization. The polarization selection performance is evaluated based on the re?ectance measurements.
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