BRAGG LIQUID CRYSTAL POLARIZATION GRATINGS

BRAGG LIQUID CRYSTAL POLARIZATION GRATINGS

A diffractive optical element comprises a plurality of liquid crystal sublayers, made of liquid crystal polarization crystals, and forming a plurality of stacked birefringent sublayers having an overall thickness (d), an average refractive index (n), and comprising liquid crystal molecule orientatio...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: KOMANDURI, Ravi K, KEKAS, Jason D, ESCUTI, Michael J
Format: Patent
Sprache:eng ; fre ; ger
Schlagworte:
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING
FREQUENCY-CHANGING
NON-LINEAR OPTICS
OPTICAL ANALOGUE/DIGITAL CONVERTERS
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
OPTICAL LOGIC ELEMENTS
OPTICS
PHYSICS
TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:A diffractive optical element comprises a plurality of liquid crystal sublayers, made of liquid crystal polarization crystals, and forming a plurality of stacked birefringent sublayers having an overall thickness (d), an average refractive index (n), and comprising liquid crystal molecule orientations that vary in a direction along respective interfaces between adjacent ones of the liquid crystal sublayers to define a grating period (Λ) of the diffractive optical element such that a variable Q is greater than 1 for an operational wavelength λ of light, where Q = 2 π λ d / Λ2 n. The liquid crystal sublayers comprise a plurality of stacked polymerized nematic liquid crystal sublayers, wherein respective thicknesses of the stacked polymerized nematic liquid crystal sublayers are less than the operational wavelength λ of the light and wherein each of the stacked polymerized nematic liquid crystal sublayers is coated and polymerized individually.