University of Central Florida Research Foundation Inc

Michael Leuenberger

Debashis Chanda

Alireza Safaei

Muhammad Waqas Shabbir

Sayan Chandra

A method is for operating a phased array. The method includes operating circuity coupled between first and second electrically conductive contacts to apply a voltage signal between the first and second electrically conductive contacts, change the voltage signal to selectively set phase change between IR radiation emitted from adjacent elliptical holes to emit the IR radiation at an angle from normal, and change the voltage signal to selectively set a frequency range of the IR radiation.

IR source and phased antenna with graphene layer and related methods

An IR source may also include an electrically conductive layer defining a back contact. The IR source may also include a first dielectric layer over the electrically conductive layer, a transparent electrically conductive layer over the first dielectric layer, and a second dielectric layer over the transparent electrically conductive layer. The IR source may include a graphene layer over the second dielectric layer and having a perforated pattern, a protective layer over the graphene layer, and first and second electrically conductive contacts coupled to the graphene layer. The graphene layer may be configured to emit IR radiation when a voltage signal is applied between the first and second electrically conductive contacts.

Various methods and devices for ultrasensitive infrared photodetection, infrared imaging, and other optoelectronic applications using the plasmon assisted thermoelectric effect in graphene are described. Infrared detection by the photo-thermoelectric uses the generation of a temperature gradient (&#x394;T) for the efficient collection of the generated hot-carriers. An asymmetric plasmon-induced hot-carrier Seebeck photodetection scheme at room temperature exhibits a remarkable responsivity along with an ultrafast response in the technologically relevant 8-12 &#x3bc;m band. This is achieved by engineering the asymmetric electronic environment of the generated hot carriers on chemical vapor deposition (CVD) grown large area nanopatterned monolayer graphene, which leads to a record &#x394;T across the device terminals thereby enhancing the photo-thermoelectric voltage beyond the theoretical limit for graphene. The results provide a strategy for uncooled, tunable, multispectral infrared detection.

Plasmon-assisted photothermoelectric effect based detection of infrared radiation on asymmetrically patterned graphene

A method is for making an optical detector device. The method may include forming a reflector layer carried by a substrate, forming a first dielectric layer over the reflector layer, and forming a graphene layer over the first dielectric layer and having a perforated pattern therein.

Optical detector device with patterned graphene layer and related methods

An optical detector device may include a substrate, a reflector layer carried by the substrate, and a first dielectric layer over the reflector layer. The optical detector device may include a graphene layer over the first dielectric layer and having a perforated pattern.

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Michael Leuenberger