Patent
Optical device with thermally switching phase change material
Peiman Hosseini,Harish Bhaskaran +1 more
TLDR
In this paper, an optical device with a layer structure consisting of a thermally conducting, optical reflector (15), an optical spacer (14), and a phase change material (10), arranged above the reflector and having at least two reversibly switchable states, in which the PCM exhibits two different values of refractive index.Abstract:
The present invention is notably directed to an optical device (1) comprising a layer structure (2) with: a thermally conducting, optical reflector (15); a thermally conducting spacer (14), which is transmissive to light and arranged above the reflector (15); and a phase change material (10), or PCM, arranged above the spacer (14) and having at least two reversibly switchable states, in which the PCM exhibits two different values of refractive index. The reflector (15), the spacer (14) and the PCM (10) are successively stacked along a stacking direction (z) of the layer structure. The optical device further comprises: a heating element (17), opposite to the PCM (10) with respect to the reflector (15), the layer structure (2) being configured so as to electrically insulate the PCM (10) from the heating element (17), while the heating element (17) is in thermal communication with the PCM (10) via the reflector (15) and the spacer (14); and a controller (19, 19a) configured to energize the heating element (17), so as to heat the PCM (10) and thereby reversibly change a refractive index of said PCM (10). The invention is further directed to related optical devices (notably devices comprising one or more pixels formed, each, by a set of layer structures such as described above) and actuation methods.read more
Citations
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Patent
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TL;DR: In this paper, a phase change material (PCM) radio frequency (RF) switch is placed over a heat spreader that is situated over the substrate to dissipate heat generated by the heating element and reduce RF noise coupling between the PCM RF switch and the IPD.
Patent
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TL;DR: In this paper, a phase change material (PCM) was used for a radio frequency (RF) switch with an active segment over the nugget, and passive segments approximately situated under the input/output contacts.
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TL;DR: In this article, a set of pixels, each having a layer structure (2, 2c, 2d) that includes: a bi-stable phase change material (10), or bistable PCM, having at least two reversibly switchable states, in which the PCM exhibits two different values of refractive index and/or optical absorption.
References
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Journal ArticleDOI
Photonic non-volatile memories using phase change materials
TL;DR: In this article, an all-photonic, non-volatile memory and processing element based on phase-change thin-films deposited onto nanophotonic waveguides was proposed.
Patent
Reflection type liquid crystal display device
Yamazaki Osamu,Ebihara Teruo,Motte Shunichi,Senbonmatsu Shigeru,Taniguchi Kaori,Fukuchi Takakazu,Hoshino Masafumi,Sakama Hiroshi,Shino Naotoshi,Yamamoto Shuhei +9 more
TL;DR: In this paper, a reflection type liquid crystal display device is constructed to include: a light modulation layer having a light scattering state changed when a voltage is applied between electrode faces; at least one kind of color separation layer arranged at the back of the liquid crystal; and a reflection layer arranged on the surface of the colour separation layer.
Patent
Thermal Interface Materials with Thin Film or Metallization
TL;DR: In this article, an exemplary embodiment of a thermal interface material assembly is provided, in which the dry material is disposed along at least a portion of the first side of the thermal interface materials.
Patent
Display device based on phase-change materials
Harish Bhaskaran,Peiman Hosseini +1 more
TL;DR: In this paper, a display device comprises a plurality of pixels, each pixel having a portion (10) of a solid-state, phase change material such as germanium-antimonium-telluride (GST) or vanadium dioxide, wherein the phase-change material can be reversibly brought into an amorphous state or a crystaline state and has a refractive index that is reversibly, electrically controllable.
Patent
Optical data storage system with multi-layer rewriting phase-change record layer
TL;DR: In this article, a multiple recording layer rewriteable phase-change optical disk (12) and disk drive uses a reverse writing type of reversible phase change material as the recording layer (53, 64) nearest the incident laser light.