A Mid-Infrared Dual-Band Filter With Ultra-High Resolving Power

A mid-infrared (mid-IR) dual-band filter with ultra-high resolving power is designed and numerically investigated. It is composed of an Al 2 O 3 layer between a gold grating and a CaF 2 substrate. Each unit cell of the grating consists of two gold strips with different heights. The filter provides t...

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Published inIEEE photonics journal Vol. 12; no. 4; pp. 1 - 10
Main Authors He, Xin, Jie, Jinliang, Yang, Junbo, Han, Yunxin, Zhang, Sen
Format Journal Article
LanguageEnglish
Published Piscataway IEEE 01.08.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Aluminum oxide
filters
Gold
Infrared filters
Microscopes
Resolution
spectroscopy
Substrates
Subwavelength structures
Unit cell
Waveguides
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Abstract A mid-infrared (mid-IR) dual-band filter with ultra-high resolving power is designed and numerically investigated. It is composed of an Al 2 O 3 layer between a gold grating and a CaF 2 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.
AbstractList 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.
A mid-infrared (mid-IR) dual-band filter with ultra-high resolving power is designed and numerically investigated. It is composed of an Al 2 O 3 layer between a gold grating and a CaF 2 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.
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.
Author Han, Yunxin
Zhang, Sen
He, Xin
Jie, Jinliang
Yang, Junbo
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Snippet A mid-infrared (mid-IR) dual-band filter with ultra-high resolving power is designed and numerically investigated. It is composed of an Al 2 O 3 layer between...
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...
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SubjectTerms Aluminum oxide
filters
Gold
Infrared filters
Microscopes
Resolution
spectroscopy
Substrates
Subwavelength structures
Unit cell
Waveguides
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Title A Mid-Infrared Dual-Band Filter With Ultra-High Resolving Power
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