A device for converting the wavelength of electromagnetic radiation is disclosed. In an embodiment the device includes a carrier, a conversion layer configured to at least partly convert a wavelength of the electromagnetic radiation and an intermediate layer, wherein the conversion layer is connected to the carrier via the intermediate layer, and wherein the intermediate layer, at least in partial regions, includes a solid layer and a connection layer.

The present disclosure discloses a saturable absorber mirror of a composite structure, including: a substrate; a buffer layer on the substrate; a distributed Bragg reflective mirror on the buffer layer; a quantum dot or quantum well saturable absorber body on the distributed Bragg reflective mirror; a graphene saturable absorber body on the quantum dot or quantum well saturable absorber body. In the present disclosure, the graphene saturable absorber body is composited with the quantum dot saturable absorber body or the quantum well saturable absorber body to be used as the saturable absorber body in the saturable absorber mirror of the present disclosure. A thermal damage threshold and an optical property stability of the saturable absorber body are improved, and an ultrafast laser pulse with high power and short pulse mode locking, a stable output repetition cycle, a narrow pulse width, and a short response time is implemented.

Electrochromic devices with reflective structure and related manufacturing methods are provided. One of the electrochromic devices includes a bottom electrode layer, an electrochromic layer on the bottom electrode layer, an electrolyte layer on the electrochromic layer, a charge storage layer on the electrolyte layer, and a top electrode on the charge storage layer. The transmittance of the electrochromic device changes in response to a voltage applied between the bottom electrode layer and the top electrode layer. One of the bottom and the top electrode layers is a reflective conductive layer, while the other being a transparent conductive layer. This electrochromic device has a simplified structure due to the removal of a separated reflective film, which also results in simplified manufacturing process.

A display device according to the disclosure comprises: a liquid crystal panel having a front surface configured to display an image; and a light source plate disposed at the rear of the liquid crystal panel configured to provide light to the liquid crystal panel, wherein the light source plate comprises: a printed circuit board having a mounting surface; an LED chip directly mounted on the mounting surface as a chip on board (COB); a transparent resin disposed on the LED chip to encompass the LED chip; a light conversion layer configured to convert the wavelength of light emitted from the LED chip and encompassing the outer peripheral surface of the transparent resin; and a barrier layer covering the light conversion layer from the outside.

A distributed Bragg reflector (DBR) structure on a substrate includes a high refractive index layer comprising titanium oxide (TiO.sub.2) and a low refractive index layer having a high carbon region and at least one low carbon region that contacts the high refractive index layer. Multiple layers of the high refractive index layer and the low refractive index layer are stacked. Typically, the multiple layers of the high refractive index layer and the low refractive index layer are stacked to a thickness of less than 10 microns. Each of the respective layers of the high refractive index layer and the low refractive index layer have a thickness of less than 0.2 microns.

Optomechanical device for frequency doubling enhancement are described. The devices include a substrate through which light of a first wavelength is introduced, a first reflector mirror, a conductive layer disposed on the first reflector mirror, and a second mirror spaced apart from the conductive layer, thereby forming an optical cavity between the second mirror and the conductive layer. The devices also include a power source coupled to the second mirror and the conductive layer and a monolayer of non-linear optical material disposed within the optical cavity, the monolayer being configured to produce light of a second wavelength upon interaction with the light of the first wavelength. The second mirror is deformable upon introduction of voltage from the power source and deformation of the second mirror changes a length of the optical cavity, thereby enhancing a power output of the light of the second wavelength produced by the monolayer.

A camera includes an optical filter for a sensor array of the camera. The optical filter includes a plurality of liquid crystal layers switchable between a reflection state and a transmission state. Each liquid crystal layer is configured to block spectral light in a different spectral light sub-band and transmit spectral light outside of the spectral light sub-band in the reflection state, and to transmit spectral light in the spectral light sub-band in the transmission state. An active illuminator of the camera is configured to emit active light in a selected spectral light sub-band. One or more of the plurality of liquid crystal layers is switched from the transmission state to the reflection state to tune the optical filter to block spectral light in all but the selected spectral light sub-band. The sensors of the sensor array are addressed to measure spectral light in the selected spectral light sub-band.

A camera includes an optical filter for a sensor array of the camera. The optical filter includes a plurality of liquid crystal layers switchable between a reflection state and a transmission state. Each liquid crystal layer is configured to block spectral light in a different spectral light sub-band and transmit spectral light outside of the spectral light sub-band in the reflection state, and to transmit spectral light in the spectral light sub-band in the transmission state. An active illuminator of the camera is configured to emit active light in a selected spectral light sub-band. One or more of the plurality of liquid crystal layers is switched from the transmission state to the reflection state to tune the optical filter to block spectral light in all but the selected spectral light sub-band. The sensors of the sensor array are addressed to measure spectral light in the selected spectral light sub-band.

Electrochromic devices with reflective structure and related manufacturing methods are provided. One of the electrochromic devices includes a bottom electrode layer, an electrochromic layer on the bottom electrode layer, an electrolyte layer on the electrochromic layer, a charge storage layer on the electrolyte layer, and a top electrode on the charge storage layer. The transmittance of the electrochromic device changes in response to a voltage applied between the bottom electrode layer and the top electrode layer. One of the bottom and the top electrode layers is a reflective conductive layer, while the other being a transparent conductive layer. This electrochromic device has a simplified structure due to the removal of a separated reflective film, which also results in simplified manufacturing process.

A camera includes a sensor array including a plurality of individually addressable sensor elements, each of the plurality of sensor elements responsive to incident light over a broad wavelength band. Covering the sensor array is a light valve switchable electronically between closed and open states. The light valve is configured to, in the closed state, block light of a stopband and transmit light outside the stopband, and, in the open state, transmit the light of the stopband. An electronic controller of the camera is configured to switch the light valve from the closed to the open state and, synchronously with switching the light valve, address the sensor elements of the sensor array.