公开(公告)号：US20180024004A1

公开(公告)日：2018-01-25

申请号：US15665596

申请日：2017-08-01

Applicant: DREXEL UNIVERSITY

Inventor： ADAM K. FONTECCHIO ,  SAMEET K. SHRIYAN ,  ALYSSA BELLINGHAM

IPC: G01J3/02 ,  G01J3/50 ,  G03F7/20 ,  G02B27/01 ,  G02F1/1334 ,  G02F1/1347 ,  G03F7/26 ,  G01J3/51

CPC classification number: G01J3/0237 ,  G01J3/502 ,  G01J3/51 ,  G02B27/0103 ,  G02F1/13342 ,  G02F1/13476 ,  G02F2203/055 ,  G03F7/20 ,  G03F7/26

Abstract: A holographic polymer dispersed liquid crystal (HPDLC) tunable filter exhibits switching times of no more than 20 microseconds. The HPDLC tunable filter can be utilized in a variety of applications. An HPDLC tunable filter stack can be utilized in a hyperspectral imaging system capable of spectrally multiplexing hyperspectral imaging data acquired while the hyperspectral imaging system is airborne. HPDLC tunable filter stacks can be utilized in high speed switchable optical shielding systems, for example as a coating for a visor or an aircraft canopy. These HPDLC tunable filter stacks can be fabricated using a spin coating apparatus and associated fabrication methods.

公开(公告)号：US20170176799A1

公开(公告)日：2017-06-22

申请号：US15452938

申请日：2017-03-08

Applicant: DREXEL UNIVERSITY

Inventor： ADAM K. FONTECCHIO ,  KASHMA RAI

IPC: G02F1/1334 ,  G03H1/04 ,  G02F1/1347 ,  G02F1/29 ,  G02F1/133 ,  G02F1/1335

CPC classification number: G02F1/13342 ,  G02F1/13306 ,  G02F1/133504 ,  G02F1/133553 ,  G02F1/1347 ,  G02F1/29 ,  G02F1/292 ,  G02F2001/133565 ,  G02F2001/13478 ,  G02F2001/294 ,  G03H1/04 ,  G03H1/0402 ,  G03H1/28 ,  G03H2001/0439 ,  G03H2001/0491 ,  G03H2001/2263 ,  G03H2222/36 ,  G03H2250/38

Abstract: Described herein is a new holographic polymer dispersed liquid crystal (HPDLC) medium with broadband reflective properties, and a new technique for fabrication of broadband HPDLC mediums. The new technique involves dynamic variation of the holography setup during HPDLC formation, enabling the broadening of the HPDLC medium's wavelength response. Dynamic variation of the holography setup may include the rotation and/or translation of one or more motorized stages, allowing for time and spatial, or angular, multiplexing through variation of the incident angles of one or more laser beams on a pre-polymer mixture during manufacture. An HPDLC medium manufactured using these techniques exhibits improved optical response by reflecting a broadband spectrum of wavelengths. A new broadband holographic polymer dispersed liquid crystal thin film polymeric mirror stack with electrically-switchable beam steering capability is disclosed.