Multilayer stacking technique for holographic polymer dispersed liquid crystals

Shriyan, Sameet K.; Kashma, K.; Bellingham, Alyssa; Fontecchio, Adam K.

doi:10.1063/1.3058763

Cited by 4 publications

(1 citation statement)

References 12 publications

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“…These are the multilayer stacking technique and the spin coating technique. The details of the multilayer stacking technique have been reported in detail elsewhere 7 . In the spin coating techniques the pre-polymer syrup was spin coated on a square glass slide and then exposed to an interference pattern generated by the laser beams and then cured under a UV lamp to cure any remnant monomers.…”

Section: Materials and Fabricationmentioning

confidence: 99%

Holographic electro-optic thin film stacks for airborne hyperspectral imaging

Shriyan

Fontecchio

2010

SPIE Proceedings

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In this work we demonstrate the feasibility of using a holographically formed thin film electro-optic stack for the development of an airborne hyperspectral imaging system in the visible wavelength range of 600nm to 800nm. Each wavelength filtering element in the stack is formed by photo-induced phase separation of a homogenous mixture of liquid crystals and photopolymers, exhibiting a uniform reflection efficiency of up to 80% across a 35mm optical aperture with non-normalized baseline transmission, polarization insensitivity for normal incidence and a spectral resolution of 10nm. Fast switching time on the order of microseconds and techniques to improve view angle in the individual wavelength filtering elements in the stack are discussed and the improvements are discussed from a morphological standpoint. Two techniques for stacking the thin films have been developed which requires lesser number of substrates hence improving transmission throughput and radiometric efficiency through the stack. An advantage of using such a stack is the ability to modulate each wavelength filtering element at a different frequency to obtain a spectral multiplex, thereby enabling synchronous detection and demodulation of each wavelength with a high update rate for the hyperspectral cube. A system level integration of such a stack into the prototype drive and detection unit is discussed in this work.

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Section: Materials and Fabricationmentioning

confidence: 99%

Holographic electro-optic thin film stacks for airborne hyperspectral imaging

Shriyan

Fontecchio

2010

SPIE Proceedings

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Electro-optic polymer liquid crystal thin films for hyperspectral imaging

Schundler

2012

J. Appl. Remote Sens

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Electrically switchable electro-optic filters for spectral line emission detection

et al. 2021

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Remote detection of spectral line emission is an important capability in a number of areas, including defense and environmental science. In this paper, we report on a mechanism for spectral line emission detection that is not based on narrow bandpass filters or hyperspectral imagers, but is instead based on the use of switchable spectral filters. The use of a switchable filter enables a single sensor to perform remote sensing tasking in a broad passband, while also detecting emission in a particular spectral line. In this case, the switchable spectral filter studied is a holographic polymer dispersed liquid crystal (HPDLC) reflection grating. The concept is demonstrated through modeling a sensor with an integrated HPDLC filter and building a detection algorithm capable of detecting spectral line emission. The modeling framework is built upon four components: the background scene, the spectral line source, the HPDLC filter, and the sensor. Results from the model show probability of detection and probability of false alarm for spectral line sources of varying strength for a particular background scene.

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Multilayer stacking technique for holographic polymer dispersed liquid crystals

Abstract: Published by the AIP PublishingArticles you may be interested in Coherent diffraction and random scattering in thiol-ene-based holographic polymer-dispersed liquid crystal reflection gratings

Cited by 4 publications

References 12 publications

Holographic electro-optic thin film stacks for airborne hyperspectral imaging

Holographic electro-optic thin film stacks for airborne hyperspectral imaging

Electro-optic polymer liquid crystal thin films for hyperspectral imaging

Electrically switchable electro-optic filters for spectral line emission detection

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