The designs of single ellipse-shape metamaterials (SESM) and cross ellipse-shape metamaterials (CESM) in the infrared (IR) wavelength range are presented. They are composed of a tailored gold (Au) layer on a silicon (Si) substrate. The characterizations of the proposed devices can have their electromagnetic responses manipulated between single-band and dual-band resonances by changing different ratios of the macro-axis and minor-axis of the ESM. The electromagnetic behavior of the dual-band resonance exhibits the resonance with a broad bandwidth or narrow bandwidth. The corresponding free spectral range (FSR) could be tuned 90 nm in transverse electric (TE) mode and 224 nm in transverse magnetic (TM) mode for SESMs. For CESMs, the FSR could be tuned 153 nm in TE mode and 230 nm in TM mode. Depending on the design of symmetrical or asymmetrical ESM, we can design ESM-like nanostructures to realize the IR filter, polarization switch, band switch, and high-efficiency sensor applications.
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Liang et al. (2019) studied this question.
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