A Mid-Infrared Dual-Band Filter With Ultra-High Resolving Power
| Autor: | Junbo Yang, Xin He, Sen Zhang, Yunxin Han, Jinliang Jie |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
lcsh:Applied optics. Photonics
spectroscopy Subwavelength structures Materials science business.industry lcsh:TA1501-1820 Resonance STRIPS Substrate (electronics) Grating Atomic and Molecular Physics and Optics law.invention filters Full width at half maximum Wavelength Optics Filter (video) law lcsh:QC350-467 Electrical and Electronic Engineering business Spectroscopy lcsh:Optics. Light |
| Zdroj: | IEEE Photonics Journal, Vol 12, Iss 4, Pp 1-10 (2020) |
| ISSN: | 1943-0647 |
| DOI: | 10.1109/jphot.2020.3006890 |
| Popis: | A mid-infrared (mid-IR) dual-band filter with ultra-high resolving power is designed and numerically investigated. It is composed of an Al2O3 layer between a gold grating and a CaF2 substrate. Each unit cell of the grating consists of two gold strips with different heights. The filter provides two high-extinction ultra-narrow stop bands. One is at a wavelength of ~3.8392 μm with a full-width at half-maximum (FWHM) of ~0.8 nm, and the other is at a wavelength of ~3.8435 μm with a FWHM of ~1.8 nm. The resolving power of the filter is >2100. The two stop bands result from the (+1) and (-1) waveguide modes, respectively. An interaction between the two resonance modes exists and affects the stop bands. We can control the interaction by adjusting the grating parameters, thus designing the FWHMs and lineshapes of the two stop bands flexibly. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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