A Broadly Tunable Surface Plasmon-Coupled Wavelength Filter for Visible and Near Infrared Hyperspectral Imaging
| Main Author: | |
|---|---|
| Language: | English |
| Published: |
Cleveland State University / OhioLINK
2018
|
| Subjects: | |
| Online Access: | http://rave.ohiolink.edu/etdc/view?acc_num=csu1522253688346498 |
| id |
ndltd-OhioLink-oai-etd.ohiolink.edu-csu1522253688346498 |
|---|---|
| record_format |
oai_dc |
| spelling |
ndltd-OhioLink-oai-etd.ohiolink.edu-csu15222536883464982021-08-03T07:05:31Z A Broadly Tunable Surface Plasmon-Coupled Wavelength Filter for Visible and Near Infrared Hyperspectral Imaging Zalavadia, Ajaykumar Chemistry Electromagnetism Optics Analytical Chemistry Physics Surface Plasmon Tunable Filter Spectral Imaging Hyperspectral Imaging Visible Near Infrared Short Range Propagating Polariton Long Range Propagating Polariton SPCTF Surface Plasmon-Coupled Tunable Filter Hyperspectral imaging is a set of techniques that has contributed to the study of advanced materials, pharmaceuticals, semiconductors, ceramics, polymers, biological specimens, and geological samples. Its use for remote sensing has advanced our understanding of agriculture, forestry, the Earth, environmental science, and the universe. The development of ultra-compact handheld hyperspectral imagers has been impeded by the scarcity of small widefield tunable wavelength filters. The widefield modality is preferred for handheld imaging applications in which image registration can be performed to counter scene shift caused by irregular user motions that would thwart scanning approaches. In the work presented here an electronically tunable widefield wavelength filter has been developed for hyperspectral imaging applications in the visible and near-infrared region. Conventional electronically tunable widefield imaging filter technologies include liquid crystal-based filters, acousto-optic tunable filters, and electronically tuned etalons; each having its own set of advantages and disadvantages. The construction of tunable filters is often complex and requires elaborate optical assemblies and electronic control circuits. I introduce in the work presented here is a novel widefield tunable filter, the surface plasmon coupled tunable filter (SPCTF), for visible and near infrared imaging. The SPCTF is based on surface plasmon coupling and has simple optical design that can be miniaturized without sacrificing performance. The SPCTF provides diffraction limited spatial resolution with a moderately narrow nominal passband (<10 nm) and a large spurious free spectral range (450 nm-1000 nm).The SPCTF employs surface plasmon coupling of the ϖ-polarized component of incident light in metal films separated by a tunable dielectric layer. Acting on the ϖ-polarized component, the device is limited to transmitting 50 percent of unpolarized incident light. This is higher than the throughput of comparable Lyot-based liquid crystal tunable filters that employ a series of linear polarizers. In addition, the SPCTF is not susceptible to the unwanted harmonic bands that lead to spurious diffraction in Bragg-based devices. Hence its spurious free spectral range covers a broad region from the blue through near infrared wavelengths. The compact design and rugged optical assembly make it suitable for hand-held hyperspectral imagers. The underlying theory and SPCTF design are presented along with a comparison of its performance to calculated estimates of transmittance, spectral resolution, and spectral range. In addition, widefield hyperspectral imaging using the SPCTF is demonstrated on model sample. 2018-03-29 English text Cleveland State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=csu1522253688346498 http://rave.ohiolink.edu/etdc/view?acc_num=csu1522253688346498 unrestricted This thesis or dissertation is protected by copyright: some rights reserved. It is licensed for use under a Creative Commons license. Specific terms and permissions are available from this document's record in the OhioLINK ETD Center. |
| collection |
NDLTD |
| language |
English |
| sources |
NDLTD |
| topic |
Chemistry Electromagnetism Optics Analytical Chemistry Physics Surface Plasmon Tunable Filter Spectral Imaging Hyperspectral Imaging Visible Near Infrared Short Range Propagating Polariton Long Range Propagating Polariton SPCTF Surface Plasmon-Coupled Tunable Filter |
| spellingShingle |
Chemistry Electromagnetism Optics Analytical Chemistry Physics Surface Plasmon Tunable Filter Spectral Imaging Hyperspectral Imaging Visible Near Infrared Short Range Propagating Polariton Long Range Propagating Polariton SPCTF Surface Plasmon-Coupled Tunable Filter Zalavadia, Ajaykumar A Broadly Tunable Surface Plasmon-Coupled Wavelength Filter for Visible and Near Infrared Hyperspectral Imaging |
| author |
Zalavadia, Ajaykumar |
| author_facet |
Zalavadia, Ajaykumar |
| author_sort |
Zalavadia, Ajaykumar |
| title |
A Broadly Tunable Surface Plasmon-Coupled Wavelength Filter for Visible and Near Infrared Hyperspectral Imaging |
| title_short |
A Broadly Tunable Surface Plasmon-Coupled Wavelength Filter for Visible and Near Infrared Hyperspectral Imaging |
| title_full |
A Broadly Tunable Surface Plasmon-Coupled Wavelength Filter for Visible and Near Infrared Hyperspectral Imaging |
| title_fullStr |
A Broadly Tunable Surface Plasmon-Coupled Wavelength Filter for Visible and Near Infrared Hyperspectral Imaging |
| title_full_unstemmed |
A Broadly Tunable Surface Plasmon-Coupled Wavelength Filter for Visible and Near Infrared Hyperspectral Imaging |
| title_sort |
broadly tunable surface plasmon-coupled wavelength filter for visible and near infrared hyperspectral imaging |
| publisher |
Cleveland State University / OhioLINK |
| publishDate |
2018 |
| url |
http://rave.ohiolink.edu/etdc/view?acc_num=csu1522253688346498 |
| work_keys_str_mv |
AT zalavadiaajaykumar abroadlytunablesurfaceplasmoncoupledwavelengthfilterforvisibleandnearinfraredhyperspectralimaging AT zalavadiaajaykumar broadlytunablesurfaceplasmoncoupledwavelengthfilterforvisibleandnearinfraredhyperspectralimaging |
| _version_ |
1719453433832931328 |