A novel surface plasmon coupled tunable wavelength filter for hyperspectral imaging

Turner, John F.; Zalavadia, Ajay

doi:10.1117/12.2274671

Cited by 1 publication

(3 citation statements)

References 30 publications

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“…An alternative to mechanical filter wheels was electronic tunable filters, which were mainly acoustooptical tunable filters (AOTF), 88 – 90 liquid crystal tunable filters (LCTF), 62 , 63 , 91 – 93 or Fabry–Perot interferometers (FPI). There existed other mechanisms for manufacturing tunable filters, such as surface plasmon coupled tunable filters; 94 however, three types described earlier are still the most popular. LCTF uses birefringence crystals to bandpass light.…”

Section: Acquisition Overviewmentioning

confidence: 99%

“…Both AOTF and LCTF require large external power and large optical pathway, which makes them unsuitable candidates for ultracompact systems. 94 While the size of the filters in AOTF and LCTF themselves is compact and lightweight (often <1 kg), 88,89,118,145,146 it is the weight of filter driver that adds up to the weight of these devices. Ishida et al 147 were able to deploy an LCTF-based system on top of a UAV.…”

Section: Spectral Scanningmentioning

confidence: 99%

“…While electrically tunable filters can achieve arbitrary waveband selection, efforts to miniaturize them were hindered by the lack of suitable compact configurations. Both AOTF and LCTF require large external power and large optical pathway, which makes them unsuitable candidates for ultracompact systems 94 . While the size of the filters in AOTF and LCTF themselves is compact and lightweight (often <1 kg), 88 , 89 , 118 , 145 , 146 it is the weight of filter driver that adds up to the weight of these devices.…”

Section: Technical Aspects Of Compact Spectral Camerasmentioning

confidence: 99%

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Compact and ultracompact spectral imagers: technology and applications in biomedical imaging

Tran

Fei

2023

J. Biomed. Opt.

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. Significance Spectral imaging, which includes hyperspectral and multispectral imaging, can provide images in numerous wavelength bands within and beyond the visible light spectrum. Emerging technologies that enable compact, portable spectral imaging cameras can facilitate new applications in biomedical imaging. Aim With this review paper, researchers will (1) understand the technological trends of upcoming spectral cameras, (2) understand new specific applications that portable spectral imaging unlocked, and (3) evaluate proper spectral imaging systems for their specific applications. Approach We performed a comprehensive literature review in three databases (Scopus, PubMed, and Web of Science). We included only fully realized systems with definable dimensions. To best accommodate many different definitions of “compact,” we included a table of dimensions and weights for systems that met our definition. Results There is a wide variety of contributions from industry, academic, and hobbyist spaces. A variety of new engineering approaches, such as Fabry–Perot interferometers, spectrally resolved detector array (mosaic array), microelectro-mechanical systems, 3D printing, light-emitting diodes, and smartphones, were used in the construction of compact spectral imaging cameras. In bioimaging applications, these compact devices were used for in vivo and ex vivo diagnosis and surgical settings. Conclusions Compact and ultracompact spectral imagers are the future of spectral imaging systems. Researchers in the bioimaging fields are building systems that are low-cost, fast in acquisition time, and mobile enough to be handheld.

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