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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.


Papers
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Journal ArticleDOI
TL;DR: With single-pixel Hadamard detection of the evanescent waves, the THz wave near-field image of an object is reconstructed from a serial of encoded sequential measurements, yielding improved signal-to-noise ratio by one order of magnitude over a raster-scanning technique.
Abstract: We demonstrate terahertz (THz) wave near-field imaging with a spatial resolution of ∼4.5 μm using single-pixel compressive sensing enabled by femtosecond-laser (fs-laser) driven vanadium dioxide (VO2)-based spatial light modulator. By fs-laser patterning a 180 nm thick VO2 nanofilm with a digital micromirror device, we spatially encode the near-field THz evanescent waves. With single-pixel Hadamard detection of the evanescent waves, we reconstructed the THz wave near-field image of an object from a serial of encoded sequential measurements, yielding improved signal-to-noise ratio by one order of magnitude over a raster-scanning technique. Further, we demonstrate that the acquisition time was compressed by a factor of over four with 90% fidelity using a total variation minimization algorithm. The proposed THz wave near-field imaging technique inspires new and challenging applications such as cellular imaging.

60 citations

Journal ArticleDOI
TL;DR: 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.

60 citations

Patent
17 Mar 2000
TL;DR: In this paper, a laser printer utilizes a total internal reflection spatial light modulator that is optimized to work with a partially coherent laser source, where a spatial filter having a slit passes designated diffracted light which corresponds to an applied electric field and is ultimately imaged onto an image plane by way of an imaging lens.
Abstract: A laser printer utilizes a total internal reflection spatial light modulator that is optimized to work with a partially coherent laser source. The laser source is a laser diode array having a plurality of multi-mode emitters. The spatial light modulator diffracts light from said laser source according to an applied electric field. A spatial filter having a slit passes designated diffracted light which corresponds to an applied electric field and the light is ultimately imaged onto an image plane by way of an imaging lens.

60 citations

Journal ArticleDOI
TL;DR: In this paper, the properties of a liquid crystal television to be used as a spatial modulator of the polarization of a laser beam are studied and a new model is proposed that takes into account additional birefringence effects resulting from border effects near the television windows.
Abstract: The properties of a liquid crystal television to be used as a spatial modulator of the polarization of a laser beam are studied. It is found that the model most commonly used for the display description does not adequately reproduce the transmission through crossed polarizers. A new model is proposed that takes into account additional birefringence effects resulting from border effects near the television windows. With this correction, the anomalous behavior of the television is explained and the throughput for different configurations is properly predicted.

60 citations

Patent
30 May 2003
TL;DR: In this article, a spatial light modulator with selectively reflective deflectable micro mirror array plates (202) fabricated from a first substrate (105) and a second substrate (206) is described.
Abstract: The invention is a spatial light modulator (100) having selectively reflective deflectable micro mirror array (103) plates (202) fabricated from a first substrate (105). On another substrate there is addressing and control circuitry (106) for the micro mirror array (103), which allows the control circuitry (106) to control a voltage applied to selected electrodes (126) associated with the micro mirror plates (204). Typically, the control circuitry (106) includes a display control (108), line memory buffers (110), a pulse width modulation array (112), and inputs for video signals (120) and graphic signals (122). The mirror array substrate (105) further has a spacer support frame (210) and hinges (206), wherein when an electrostatic force is applied to the micro mirror array plates (204), the hinges attached thereto allow the mirror plates (204) to rotate relative to the spacer support frame (210). This rotation produces the angular deflection for the reflecting light in a selected direction. The first and second substrate are bonded together.

60 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023137
2022321
2021266
2020451
2019460
2018452