Spatial light modulator

About: Spatial light modulator is a research topic. Over the lifetime, 9043 publications have been published within this topic receiving 130143 citations.

High contrast spatial light modulator and method

Abstract: The upper portion of the high contrast SLM is fully covered by arrays of micro-mirrors with a flat optically reflective layer (102) on the upper surfaces and a pair of embedded torsion hinges (106) under the cavities in the lower portion of mirror plate (103). Torsion hinges (106) in the mirror plate (103) are fabricated to be part of the mirror plate (103) and are kept a minimum distance under the reflective surface to allow only a gap for a predetermined angular rotation. By minimizing the distances between a hinge rotating axes (106) to the upper reflective surfaces (102), the SLM effectively eliminates the horizontal displacement of each minor during an angular transition. According to the present invention, the gaps between adjacent mirrors in the array of SLM can be reduced to less than 0.2 microns to achieve the highest active reflection area fill-ratio of a micro-mirror array at the present time.

Homogenized Fourier transform holographic data storage using phase spatial light modulators and methods for recovery of data from the phase image.

Abstract: We present a method for homogenizing the Fourier spectrum for holographic digital data storage by use of a phase spatial light modulator (SLM), and methods for the recovery of data from a phase image are implemented and discussed. Binary digital data are displayed on a phase SLM operating in 0 and π phase modes to optimally remove the intense dc peak so as to obtain a homogenized Fourier spectrum. Methods based on holographic interferometry have been developed and employed for recovery of the original amplitude data page from the phase-data page. A new edge-detection-based method also has been demonstrated and analyzed for reconstruction of the original data. Experimental results are presented to confirm the feasibility of these novel techniques.

Holographic mode-selective launch for bandwidth enhancement in multimode fiber.

Abstract: With rapidly growing bandwidth demands in Local Area Networks, it is imperative to support next generation speeds beyond 40Gbit/s. Various holographic optimization techniques using spatial light modulators have recently been explored for adaptive channel impulse response improvement of MMF links. Most of these experiments are algorithmic-oriented. In this paper, a set of lenses and a spatial light modulator, acting as a binary amplitude filter, played the pivotal role in generating the input modal electric field into a graded-index MMF, rather than algorithms. By using a priori theoretical information to generate the incident modal electric field at the MMF, the bandwidth was increased by up to 3.4 times.

Divided reset for addressing spatial light modulator

Abstract: A method of implementing pulse-width modulation in a display system ( 10, 20 ) that uses a spatial light modulator (SLM) ( 15 ). Each frame of data is divided into bit-planes, each bit-plane having one bit of data for each display element of the SLM and representing a bit weight of the intensity value to be displayed by the display elements. Each bit-plane has a display time corresponding to a portion of the frame period, with bit-planes of more significant bits having longer portions. The SLM is divided into reset groups connected to different reset lines ( 34 ), so that one reset group can be loaded and its display time begun while the next reset group is loaded. (FIG. 3 ). Short bit-planes are possible because the display time need not include the time to load the entire array, and for any reset group, its reset can be delayed while other reset groups are loaded.