Journal ArticleDOI
Quantized complex ferroelectric liquid crystal spatial light modulators.
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TLDR
A spatial light modulator design consisting of cascaded or sandwiched layers of ferroelectric liquid crystals (FLC's) is investigated and the interrelation between the FLC material, the polarization of the incident illumination, and the achievable modulation states is characterized.Abstract:
A spatial light modulator design consisting of cascaded or sandwiched layers of ferroelectric liquid crystals (FLC's) is investigated. The interrelation between the FLC material, the polarization of the incident illumination, and the achievable modulation states is characterized. Magnitude modulation is accomplished by standard methods by addressing the FLC layer with linearly polarized light and following it with a properly oriented analyzer. When the FLC is addressed with circularly polarized light, lossless phase modulation results with the phase states separated by twice the angle of rotation of the optical axes. A continuum of elliptical polarization states ties together the lossless phase states achievable by using circular polarization with the more well-known 0 degrees -180 degrees phase states obtainable with linearly polarized light. Layers of various bistable FLC materials can be cascaded, possibly with polarization control layers between some of the layers, to yield a spatial light modulator that produces multip e quantized bits of complex-valued modulation and with independent control of magnitude and phase states. Four-state phase modulation, ternary amplitude-phase modulation, and four-state magnitude modulation are demonstrated experimentally by using two layers of FLC.read more
Citations
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Journal ArticleDOI
Polarization of light and topological phases
TL;DR: In this article, a survey and analysis of recent work on topological phases with polarization of light is presented, which has revealed several counterintuitive features of such phase shifts such as 2 nπ anholonomies, nonlinear and discontinuous behaviour originating from high singularities, peculiar spectral dependence, etc.
Journal ArticleDOI
Multiple-phase retrieval for optical security systems by use of random-phase encoding
TL;DR: The technique of the multiple phase encoding for optical security and verification systems is presented, based on a 4-f optical correlator, and according to the simulation results, two and three phase masks are enough to design an efficient security verification system with 64 and 32 phase levels, respectively.
Journal ArticleDOI
Complex amplitude modulation by use of liquid-crystal spatial light modulators
TL;DR: The conditions for implementation of complex amplitude modulation on standard liquid-crystal spatial light modulators when illuminated by polarized light are proposed and first attempt at nomenclature is proposed.
Journal ArticleDOI
Ferroelectric liquid crystals: Excellent tool for modern displays and photonics
TL;DR: In this article, a review of different electro-optical modes for ferroelectric liquid crystals is presented, including the Clark-Lagerwall effect, deformed helix effect, electrically suppressed helix (ESH) mode, DHF orientational Kerr effect, and ESH diffraction modes.
Journal ArticleDOI
White-light Phase-stepping Interferometry for Surface Profiling
P. Hariharan,Maitreyee Roy +1 more
TL;DR: In this article, an achromatic phase shifter operating on the geometric phase can be used to evaluate the fringe contrast directly and to locate the position of the zero-order white-light fringe along the scanning axis.
References
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Journal ArticleDOI
Characteristics Of The Deformable Mirror Device For Optical Information Processing
Dennis R. Pape,Larry J. Hornbeck +1 more
TL;DR: In this article, a deformable mirror device (DMD) is proposed for optical information processing applications, which consists of a 128x128 array of deformable mirrors addressed by an underlying array of metal-oxide-semiconductor (MOS) transistors.
Journal ArticleDOI
High-speed binary optically addressed spatial light modulator
Garret Moddel,Kristina M. Johnson,W. Li,Robert A. Rice,L. A. Pagano-Stauffer,Mark A. Handschy +5 more
TL;DR: In this paper, a high speed optically addressed spatial light modulator (OASLM) with a hydrogenated amorphous silicon (a•Si:H) photosensor and a ferroelectric liquid crystal modulator is described.
Journal ArticleDOI
Transform-ratio ternary phase-amplitude filter formulation for improved correlation discrimination
TL;DR: Performance of ternary-valued (-1,0,1) correlation filters based on the ratio of spectral energies of target and nontarget patterns is investigated, and results confirm the intuitive expectation that such filters can enhance signalto- clutter and discrimination performance for target recognition in the presence of large amounts of input noise.
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