Spectral separation of surface-plasmon-polariton modes to achieve ultranarrow dual-band absorbers
| Autor: | Sen Zhang, Yunxin Han, Xin He, Junbo Yang, Jinliang Jie |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Silicon business.industry chemistry.chemical_element 02 engineering and technology Grating 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Surface plasmon polariton Electronic Optical and Magnetic Materials 010309 optics Wavelength chemistry Excited state 0103 physical sciences Optoelectronics 0210 nano-technology Absorption (electromagnetic radiation) Spectroscopy business Refractive index |
| Zdroj: | Journal of Nanophotonics. 14:1 |
| ISSN: | 1934-2608 |
| DOI: | 10.1117/1.jnp.14.026020 |
| Popis: | We designed and studied a narrowband absorber with two absorption peaks for mid-infrared spectroscopy and multispectral detection applications. The absorber is composed of a silicon grating loaded on a continuous gold film. The grating has two silicon strips in each unit cell, with the same height but different widths. Numerical results indicate that the absorption peaks under normal incidence locate at wavelengths of ∼3.863 and ∼4.004 μm, with bandwidths of ∼28 and ∼33 nm, respectively. Both peaks exhibit high absorptivities of >0.996. We found that the excited surface-plasmon-polariton modes traveling in different directions in the structure are spectrally separated and result in the two absorption peaks. |
| Databáze: | OpenAIRE |
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