According to some aspects, a transmissive and all-dielectric optical component/limiter with great cutoff efficiency using Vanadium Dioxide (VO.sub.2) as the active component is disclosed. In some embodiments, Vanadium dioxide is used for an optical limiter due to the large contrast in optical constants upon undergoing the semiconductor to metal phase transition. When triggered optically, this transition occurs within 60 fs, making the device suitable for an ultrafast laser environment. In addition, the phase transition threshold is tunable by applying stress or doping; therefore, the device cutoff intensity can be adjusted to fulfill specific requirements.

Color-conversion structures for converting input pump light of a color to one or more differing colors. In some embodiments, the color-conversion structure includes a color-conversion (CC) layer having an input-side coating configured to optimize the amount of the pump light reaching the CC layer and to optimize the amount of color-converted light output by the CC layer. In some embodiments, the CC layer has an output-side coating configured to minimize the amount of unconverted pump light output from the CC layer and to maximize the color-converted light output from the CC layer. Various treatment for enhancing the performance of color-converting structures are also disclosed, as are a number of material combinations for quantum-well (QW) based CC layers and alternatives to QW-based CC layers. Also disclosed are light-emitting structures that each include a color-conversion structure made in accordance with the present disclosure, as well as displays composed of such light-emitting structures.

The present invention relates to a device for converting a frequency of an electromagnetic wave and, more specifically, to a device for converting an original frequency of an electromagnetic wave into a frequency corresponding to a resonator mode by using a time-varying Fabry-Perot resonator including a time-varying reflective surface of which reflectivity changes with time. A device for converting a frequency of an electromagnetic wave according to an embodiment of the present invention comprises: a time-varying reflective surface on which an electromagnetic wave is incident and of which reflectivity changes with time; and a partially reflective surface which is disposed at a predetermined distance from the time-varying reflective surface, from which an electromagnetic wave having a frequency corresponding to a resonator mode is emitted, and which has a fixed reflectivity for partially reflecting the electromagnetic wave incident through the time-varying reflective surface, wherein the reflectivity of the time-varying reflective surface is smaller than the reflectivity of the partially reflective surface, and after the electromagnetic wave is trapped between the time-varying reflective surface and the partially reflective surface, the reflectivity of the time-varying reflective surface becomes greater than the reflectivity of the partial reflective surface.

A laser source includes a first laser device configured to generate a first laser beam having a first wavelength, a second laser device configured to generate a second laser beam having a second wavelength, which is different from the first wavelength, and a non-linear crystal configured to receive simultaneously the first and second laser beams and to generate a third laser beam that has a third wavelength, which is larger than each of the first and second wavelengths. The non-linear crystal has a length and a width, and a variable poling period is distributed across the width so that the third wavelength varies within a given wavelength range based on an incident position of the first and second laser beams along the width of the non-linear crystal.

An apparatus includes an optical medium characterized by a third-order nonlinear optical susceptibility. The apparatus also includes a pump light source in optical communication with the optical medium and configured to send a pump light beam to the optical medium. The pump light beam includes a pulsed light beam. The apparatus also includes a drive light source in optical communication with the optical medium and configured to send a drive light beam to the optical medium. The drive light beam includes a continuous wave (CW) light beam. The pump light beam and the drive light beam are configured to generate a signal light beam in a squeezed state of light via spontaneous four-wave mixing in the optical medium.

Systems, devices, and methods are provided for all-optical reconfigurable activation devices for realizing various activations functions having normalized output power. The device and systems disclosed herein include an interferometer comprising a first branch formed of a first waveguide and a second branch formed of a second waveguide. A resonator cavity is coupled to the second first waveguide and at least one phase-shift mechanism is coupled to one of the second waveguide and the resonator cavity. The at least one phase-shift mechanism is configured to control biases of the interferometer to achieve a desired activation function at an output of the interferometer, and an optical amplification mechanism is coupled to the output of the interferometer and configured to add optical gain to the desired activation function.

Color-conversion structures for converting input pump light of a color to one or more differing colors. In some embodiments, the color-conversion structure includes a color-conversion (CC) layer having an input-side coating configured to optimize the amount of the pump light reaching the CC layer and to optimize the amount of color-converted light output by the CC layer. In some embodiments, the CC layer has an output-side coating configured to minimize the amount of unconverted pump light output from the CC layer and to maximize the color-converted light output from the CC layer. Various treatment for enhancing the performance of color-converting structures are also disclosed, as are a number of material combinations for quantum-well (QW) based CC layers and alternatives to QW-based CC layers. Also disclosed are light-emitting structures that each include a color-conversion structure made in accordance with the present disclosure, as well as displays composed of such light-emitting structures.

A wavelength conversion member is disclosed. In one aspect, the wavelength conversion member includes a first substrate, a second substrate formed over the first substrate, and a wavelength conversion layer interposed between the first and second substrates. A sealant is interposed between the first and second substrates and surrounds the wavelength conversion layer.

There is disclosed a method of generating terahertz radiation which comprises: (a) depositing an ink on a substrate (2), wherein the ink comprises particles (3) of a semiconductor; (b) allowing the ink to form a coating; (c) shining a laser onto the coating so as to generate terahertz radiation.

An electronic device includes: an anode and a cathode facing each other; a quantum dot emission layer disposed between the anode and the cathode and including a plurality of quantum dots; and a light emitting source, wherein the quantum dot emission layer is configured to receive electrical energy from the anode and the cathode and to emit light having a first wavelength, wherein the quantum dot emission layer and the light emitting source are configured so that the light emitting source provides the quantum emission layer with light having a second wavelength, and the plurality of quantum dots are excited by the light having the second wavelength and emit light having a third wavelength, wherein the anode, the cathode, or a combination thereof is a light transmitting electrode, and the light of the first wavelength and the light of the third wavelength are emitted through the light transmitting electrode.