Dependence of transmission half-width of narrow-band optical interference filters on the refractive index of the middle layer

1967 ◽  
Vol 7 (5) ◽  
pp. 520-521
Author(s):  
G. P. Konyukhov ◽  
E. A. Nesmelov ◽  
M. A. Validov ◽  
I. S. Gainutdinov
Keyword(s):  
Refractive Index ◽  
Narrow Band ◽  
Middle Layer ◽  
Half Width ◽  
Optical Interference ◽  
Interference Filters

Optical Interference Filters By Sol-Gel Processing

1990 ◽  
Vol 180 ◽  
Author(s):  
J.L. Keddie ◽  
E.P. Giannelis
Keyword(s):  
Refractive Index ◽  
Rutherford Backscattering Spectrometry ◽  
Incident Light ◽  
Sol Gel ◽  
Theoretical Modeling ◽  
Optical Interference ◽  
Interference Filters ◽  
The Individual ◽  
Gel Processing ◽  
Good Agreement

ABSTRACTOptical interference filters have been synthesized by sol-gel. The selected filter is a multilayer of alternating TiO2 and SiO2 films. In transmission, the filter edge depends on the angle of incident light, which can be tailored through control of thickness and refractive index of the individual films. Theoretical modeling of the filter with film thicknesses obtained by Rutherford backscattering spectrometry is in good agreement with the experimental optical response.

Optical Interference Filters Made of Porous Silicon

1996 ◽  
Vol 431 ◽  
Author(s):  
M. Thönissen ◽  
M. G. Berger ◽  
M. Krüger ◽  
S. Billat ◽  
R. Arens-Fischer ◽  
...  
Keyword(s):  
Refractive Index ◽  
Porous Silicon ◽  
Current Density ◽  
Layer Structure ◽  
Single Layer ◽  
Bragg Reflectors ◽  
Optical Interference ◽  
Interference Filters ◽  
Thickness Measurements ◽  
Reflectance Measurements

AbstractPorous silicon (PS) layers can easily be formed by an electrochemical etch process using a mixture of hydrofluoric acid (HF) and ethanol. The microstructure and porosity of the layers depend on the HF concentration, the doping level of the substrate and the current density applied during the etch process. Changing the current density during the etch process will result in a well defined layer structure consisting of layers with different porosities. Each single layer can be treated as an effective medium exhibiting a refractive index depending mainly on the porosity of the layer. Using reflectance measurements we have investigated the dependence of the refractive index of PS layers on the formation current density for different substrates. In addition the etch rate was determined by thickness measurements with an electron microscope. Based on these results various kinds of optical interference filters were studied. We have formed samples consisting of discrete single layers with different porosities (e.g. Bragg reflectors) as well as samples with continuous variation of the refractive index (rugate filters). Combining these PS filters with standard photolithography steps, microoptical devices such as spectral sensitive photodiodes can be realized.

scholarly journals Demonstration of optical interference filters utilizing tunable refractive index layers

2010 ◽  
Vol 18 (S4) ◽  
pp. A594 ◽  
Author(s):  
David J. Poxson ◽  
Frank W. Mont ◽  
Martin F. Schubert ◽  
Jong Kyu Kim ◽  
Jaehee Cho ◽  
...  
Keyword(s):  
Refractive Index ◽  
Optical Interference ◽  
Interference Filters ◽  
Tunable Refractive Index

scholarly journals Perfect Absorption and Refractive-Index Sensing by Metasurfaces Composed of Cross-Shaped Hole Arrays in Metal Substrate

Nanomaterials ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 63
Author(s):  
Zhendong Yan ◽  
Chaojun Tang ◽  
Guohua Wu ◽  
Yumei Tang ◽  
Ping Gu ◽  
...  
Keyword(s):  
Refractive Index ◽  
High Performance ◽  
Narrow Band ◽  
Label Free ◽  
Hybrid Mode ◽  
Perfect Absorption ◽  
Refractive Index Sensing ◽  
Sensing Applications ◽  
Silver Substrate ◽  
Hole Arrays

Achieving perfect electromagnetic wave absorption with a sub-nanometer bandwidth is challenging, which, however, is desired for high-performance refractive-index sensing. In this work, we theoretically study metasurfaces for sensing applications based on an ultra-narrow band perfect absorption in the infrared region, whose full width at half maximum (FWHM) is only 1.74 nm. The studied metasurfaces are composed of a periodic array of cross-shaped holes in a silver substrate. The ultra-narrow band perfect absorption is related to a hybrid mode, whose physical mechanism is revealed by using a coupling model of two oscillators. The hybrid mode results from the strong coupling between the magnetic resonances in individual cross-shaped holes and the surface plasmon polaritons on the top surface of the silver substrate. Two conventional parameters, sensitivity (S) and figure of merit (FOM), are used to estimate the sensing performance, which are 1317 nm/RIU and 756, respectively. Such high-performance parameters suggest great potential for the application of label-free biosensing.

scholarly journals Trinary mappings: a tool for the determination of potential spectral paths for optical monitoring of optical interference filters

2018 ◽  
Vol 57 (24) ◽  
pp. 7012 ◽  
Author(s):  
Mael Vignaux ◽  
Fabien Lemarchand ◽  
Thomas Begou ◽  
Catherine Grèzes-Besset ◽  
Julien Lumeau
Keyword(s):  
Optical Monitoring ◽  
Optical Interference ◽  
Interference Filters

Fabrication of Al2O3/SiO2 multilayer reflective filters with excellent uniformity for demanding optical interference filters

2019 ◽  
Vol 6 (6) ◽  
pp. 066410 ◽  
Author(s):  
Vemuri SRS Praveen Kumar ◽  
Mukesh Kumar ◽  
Neelam Kumari ◽  
Vinod Karar ◽  
Amit L Sharma
Keyword(s):  
Optical Interference ◽  
Interference Filters

scholarly journals Theoretical Investigation of a Simple Design of Triple-Band Terahertz Metamaterial Absorber for High-Q Sensing

2019 ◽  
Vol 9 (7) ◽  
pp. 1410 ◽  
Author(s):  
Tao Chen ◽  
Runyu Zhao ◽  
Ben-Xin Wang
Keyword(s):  
Refractive Index ◽  
Narrow Band ◽  
Metamaterial Absorber ◽  
Resonance Absorption ◽  
Simple Design ◽  
Perfect Absorption ◽  
High Q ◽  
Au Film ◽  
Resonance Modes ◽  
Triple Band

This paper presents a simple metamaterial design to achieve the triple-band near-perfect absorption response that can be used in the area of sensor application. The introduced absorber consists of an array of Au strip and a bulk flat Au film separated by an insulator dielectric layer. Three narrow-band resonance absorption peaks are obtained by superposing three different modes (a fundamental mode resonance and two high-order responses) of the Au strip. These resonance modes (in particular of the last two modes) have large sensitivity to the changes of the surrounding index, overlayer thickness and the refractive index of the overlayer.

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