Abstract: A porous thin film includes a framework that includes a plurality of pores. The pores extend from an opening located at an upper surface of the framework to a bottom surface contained in the framework. A pore-coating film is formed on sidewalls and the bottom surface of the pores.

Abstract: Embodiments are provided for fabrication of superconducting devices using area-selective deposition of a metal nitride. In some embodiments, a method can include providing a thermally treated carbon layer, and selectively depositing a metal nitride using the thermally treated carbon layer for formation of a superconducting device.

Abstract: A semiconductor structure comprises a substrate, a patch of optically tunable material disposed over the substrate, a first electrode coupled to the patch of optically tunable material and a switch providing a current source, and a second electrode coupled to the patch of optically tunable material and a ground voltage. The first electrode and the second electrode are configured to modify a state of the patch of optically tunable material to adjust a reflectivity of the patch of optically tunable material.

Abstract: A tunable metasurface is provided. The tunable metasurface includes a mirror, a dielectric layer disposed on the mirror, a metallic antenna and a phase change material (PCM) layer. The PCM layer is interposed between the dielectric layer and the metallic antenna. The PCM layer is configured to be amorphous or crystalline. The mirror, the dielectric layer, the metallic antenna and the PCM layer cooperatively form a Fabry Perot cavity in which light incident on the metallic antenna from free space is reflected between the mirror and the metallic antenna. The PCM layer has blanket dimensions relative to those of the metallic antenna such that the Fabry Perot cavity is critically coupled with the free space when the PCM layer is only one of amorphous and crystalline.

Abstract: A nanotube polariton quantum dot photon source device includes a substrate. A nanotube is arranged on the substrate, and an incident light source is configured to generate an exciton-plasmon polariton excitation in the nanotube. The nanotube emits a photon in response to the generated exciton plasmon polariton excitation. The nanotube has a length L < 50 nm to emit one or more photons at a desired frequency.

Abstract: A tunable metasurface is provided. The tunable metasurface includes a mirror, a dielectric layer disposed on the mirror, a metallic antenna and a phase change material (PCM) layer. The PCM layer is interposed between the dielectric layer and the metallic antenna. The PCM layer is configured to be amorphous or crystalline. The mirror, the dielectric layer, the metallic antenna and the PCM layer cooperatively form a Fabry Perot cavity in which light incident on the metallic antenna from free space is reflected between the mirror and the metallic antenna. The PCM layer has blanket dimensions relative to those of the metallic antenna such that the Fabry Perot cavity is critically coupled with the free space when the PCM layer is only one of amorphous and crystalline.

Abstract: A porous thin film includes a framework that includes a plurality of pores. The pores extend from an opening located at an upper surface of the framework to a bottom surface contained in the framework. A pore-coating film is formed on sidewalls and the bottom surface of the pores.

Abstract: Embodiments are provided for fabrication of superconducting devices using area-selective deposition of a metal nitride. In some embodiments, a method can include providing a thermally treated carbon layer, and selectively depositing a metal nitride using the thermally treated carbon layer for formation of a superconducting device.

Abstract: According to an embodiment of the present invention, a method of producing a computing device includes providing a semiconductor substrate, and patterning a mask on the semiconductor substrate, the mask exposing a first portion of the semiconductor substrate and covering a second portion of the semiconductor substrate. The method includes implanting the first portion of the semiconductor substrate with a dopant. The method includes annealing the first portion of the semiconductor substrate to form an annealed doped region, while maintaining the second portion of the semiconductor substrate as an unannealed portion.

Abstract: An apparatus includes two or more electrically rotatable antennas providing a reconfigurable metasurface, each of the electrically rotatable antennas including a disk of optically tunable material. The apparatus also includes a control circuit including a plurality of switches each coupled to (i) one of a plurality of electrodes, the plurality of electrodes being arranged proximate different portions of at least one surface of each of the disks of optically tunable material and (ii) to at least one of a current source and a ground voltage. The control circuit is configured to modify states of portions of the optically tunable material in each of the disks of optically tunable material utilizing current supplied between at least two of the plurality of electrodes to adjust reflectivity of the portions of the optically tunable material to dynamically reconfigure respective antenna shape configurations of each of the electrically rotatable antennas.

Abstract: An apparatus includes two or more tunable antennas providing a reconfigurable metasurface, each of the tunable antennas including a plurality of pixels of optically tunable material, and a control circuit including switches providing current sources and a ground voltage, the switches being coupled to respective ones of the pixels of optically tunable material in each of the tunable antennas via first electrodes, the ground voltage being coupled to respective ones of the pixels of optically tunable material in each of the tunable antennas via second electrodes. The control circuit is configured to modify states of respective ones of the plurality of pixels of optically tunable material in the tunable antennas utilizing current supplied between the first electrodes and the second electrodes to adjust reflectivity of the plurality of pixels of optically tunable material in each of the tunable antennas to dynamically reconfigure respective antenna shape configurations of the tunable antennas.

Abstract: According to an embodiment of the present invention, a method of producing a computing device includes providing a semiconductor substrate, and patterning a mask on the semiconductor substrate, the mask exposing a first portion of the semiconductor substrate and covering a second portion of the semiconductor substrate. The method includes implanting the first portion of the semiconductor substrate with a dopant. The method includes annealing the first portion of the semiconductor substrate to form an annealed doped region, while maintaining the second portion of the semiconductor substrate as an unannealed portion.

Abstract: A semiconductor structure comprises a substrate, a patch of optically tunable material disposed over the substrate, a first electrode coupled to the patch of optically tunable material and a switch providing a current source, and a second electrode coupled to the patch of optically tunable material and a ground voltage. The first electrode and the second electrode are configured to modify a state of the patch of optically tunable material to adjust a reflectivity of the patch of optically tunable material.

Abstract: An apparatus includes two or more groups of antennas, each including two or more patches of optically tunable material providing two or more antennas. The tunable geometric metasurface also includes a control circuit including a plurality of switches providing current sources and a ground voltage. The plurality of switches are coupled to respective ones of the patches of optically tunable material in each of the groups of antennas via first electrodes. The ground voltage is coupled to respective ones of the patches of optically tunable material in each of the groups of antennas via second electrodes. The control circuit is configured to modify states of the antennas in each of the groups of antennas utilizing the first electrodes and the second electrodes to adjust reflectivity of the patches of optically tunable material to provide a tunable geometric metasurface.

Abstract: An apparatus includes an array of metal nanowires embedded in a matrix of optically tunable material providing a tunable hyperbolic metamaterial, and a control circuit including (i) a current source coupled to first ends of the array of metal nanowires and (ii) a ground voltage coupled to second ends of the array of metal nanowires. The control circuit is configured to modify a state of the optically tunable material utilizing current supplied between the first and second ends of the array of metal nanowires to dynamically reconfigure optical properties of the tunable hyperbolic metamaterial.

Abstract: An apparatus includes two or more tunable antennas providing a reconfigurable metasurface, each of the tunable antennas including a plurality of pixels of optically tunable material, and a control circuit including switches providing current sources and a ground voltage, the switches being coupled to respective ones of the pixels of optically tunable material in each of the tunable antennas via first electrodes, the ground voltage being coupled to respective ones of the pixels of optically tunable material in each of the tunable antennas via second electrodes. The control circuit is configured to modify states of respective ones of the plurality of pixels of optically tunable material in the tunable antennas utilizing current supplied between the first electrodes and the second electrodes to adjust reflectivity of the plurality of pixels of optically tunable material in each of the tunable antennas to dynamically reconfigure respective antenna shape configurations of the tunable antennas.

Abstract: An apparatus includes an array of metal nanowires embedded in a matrix of optically tunable material providing a tunable hyperbolic metamaterial, and a control circuit including (i) a current source coupled to first ends of the array of metal nanowires and (ii) a ground voltage coupled to second ends of the array of metal nanowires. The control circuit is configured to modify a state of the optically tunable material utilizing current supplied between the first and second ends of the array of metal nanowires to dynamically reconfigure optical properties of the tunable hyperbolic metamaterial.

Abstract: An apparatus includes two or more electrically rotatable antennas providing a reconfigurable metasurface, each of the electrically rotatable antennas including a disk of optically tunable material. The apparatus also includes a control circuit including a plurality of switches each coupled to (i) one of a plurality of electrodes, the plurality of electrodes being arranged proximate different portions of at least one surface of each of the disks of optically tunable material and (ii) to at least one of a current source and a ground voltage. The control circuit is configured to modify states of portions of the optically tunable material in each of the disks of optically tunable material utilizing current supplied between at least two of the plurality of electrodes to adjust reflectivity of the portions of the optically tunable material to dynamically reconfigure respective antenna shape configurations of each of the electrically rotatable antennas.

Abstract: An apparatus includes two or more groups of antennas, each including two or more patches of optically tunable material providing two or more antennas. The tunable geometric metasurface also includes a control circuit including a plurality of switches providing current sources and a ground voltage. The plurality of switches are coupled to respective ones of the patches of optically tunable material in each of the groups of antennas via first electrodes. The ground voltage is coupled to respective ones of the patches of optically tunable material in each of the groups of antennas via second electrodes. The control circuit is configured to modify states of the antennas in each of the groups of antennas utilizing the first electrodes and the second electrodes to adjust reflectivity of the patches of optically tunable material to provide a tunable geometric metasurface.

Abstract: The subject embodiments relate to carbon nanotube (CNT) transistors with carrier blocking using thin dielectric under the drain or source and drain contacts. According to an embodiment, a transistor is provided that comprises a CNT channel layer, a metal source contact formed on the carbon nanotube channel layer, and a metal drain contact formed on the carbon nanotube channel layer. The transistor structure further comprises a drain dielectric layer formed adjacent to and between a lower surface of the metal drain contact and an upper surface of the carbon nanotube channel layer. In one or more implementations, the drain dielectric layer comprises a material that suppresses injection of a first type of carrier into the CNT channel layer and facilitates the injection of a second type of carrier into the CNT channel layer.