Electronically tunable narrow-band-pass optical filter for spectral imaging

1996 ◽  
Author(s):  
Duane E. Paulsen ◽  
Vladimir Pelekhaty ◽  
XiaoLu L. Wang
Keyword(s):  
Narrow Band ◽  
Optical Filter ◽  
Spectral Imaging ◽  
Band Pass ◽  
Electronically Tunable

scholarly journals Bandwidth-variable tunable optical filter unit for illumination and spectral imaging systems using thin-film optical band-pass filters

2013 ◽  
Vol 84 (4) ◽  
pp. 043113 ◽  
Author(s):  
Georg Hennig ◽  
Gary M. Brittenham ◽  
Ronald Sroka ◽  
Gesa Kniebühler ◽  
Michael Vogeser ◽  
...  
Keyword(s):  
Thin Film ◽  
Optical Filter ◽  
Spectral Imaging ◽  
Imaging Systems ◽  
Tunable Optical Filter ◽  
Band Pass ◽  
Filter Unit

A Switchable Optical Filter between Band-stop and Band-pass Responses

2020 ◽  
Author(s):  
Weijun Jiang ◽  
Lu Xu ◽  
Xiaolong Liu ◽  
Yu Yu ◽  
Yuan Yu ◽  
...  
Keyword(s):  
Optical Filter ◽  
Band Pass

Superconducting narrow band pass filters for advanced multiplexers

2002 ◽  
Author(s):  
A. Fathy ◽  
D. Kalokitis ◽  
V. Pendrick ◽  
E. Balohoubek ◽  
A. Pique ◽  
...  
Keyword(s):  
Narrow Band ◽  
Band Pass

Plasmonic Metasurface Filter with Full Color Sensitivity and Narrow Band-pass in Visible Region

JETP Letters ◽  
2021 ◽  
Author(s):  
R. Zhang ◽  
X. Guo ◽  
H. Qiu ◽  
X. Liu ◽  
M. Han ◽  
...  
Keyword(s):  
Narrow Band ◽  
Visible Region ◽  
Full Color ◽  
Color Sensitivity ◽  
Band Pass

scholarly journals Bandwidth Tunable Optical Bandpass Filter Based on Parity-Time Symmetry

Micromachines ◽  
2022 ◽  
Vol 13 (1) ◽  
pp. 89
Author(s):  
Bowen Zhang ◽  
Nuo Chen ◽  
Xinda Lu ◽  
Yuhang Hu ◽  
Zihao Yang ◽  
...  
Keyword(s):  
Wavelength Division Multiplexing ◽  
Tuning Range ◽  
Extinction Ratio ◽  
Optical Filter ◽  
Optimized Design ◽  
Coupling Coefficients ◽  
Large Bandwidth ◽  
Time Symmetry ◽  
Bandwidth Tuning ◽  
Band Pass

A chip-scale tunable optical filter is indispensable to meeting the demand for reconfigurability in wavelength division multiplexing systems, channel routing, and switching, etc. Here, we propose a new scheme of bandwidth tunable band-pass filters based on a parity-time (PT) symmetric coupled microresonator system. Large bandwidth tunability is realized on the basis of the tuning of the relative resonant frequency between coupled rings and by making use of the concept of the exception point (EP) in the PT symmetric systems. Theoretical investigations show that the bandwidth tuning range depends on the intrinsic loss of the microresonators, as well as on the loss contrast between the two cavities. Our proof-of-concept device confirms the tunability and shows a bandwidth tuning range from 21 GHz to 49 GHz, with an extinction ratio larger than 15 dB. The discrepancy between theory and experiment is due to the non-optimized design of the coupling coefficients, as well as to fabrication errors. Our design based on PT symmetry shows a distinct route towards the realization of tunable band-pass filters, providing new ways to explore non-Hermitian light manipulation in conventional integrated devices.

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