2results about How to "Enables tunability" patented technology

The application discloses a reconfigurable indium tin oxide-based mid-infrared metasurface filter device, which comprises a substrate, a dielectric layer and a metasurface structure unit arranged on the substrate in sequence; the metasurface structure unit is concentrically arranged with the dielectric layer and jointly forms a basic unit, and the basic unit is periodically arranged on the upper surface of the substrate; the material of the metasurface structure unit is indium tin oxide, so that the device can work stably for a long time under complex working conditions. Meanwhile, the amorphous phase has a relatively low refractive index and extinction coefficient in the mid-infrared wave band, which is beneficial to reducing the internal optical loss of the device. By adjusting the key geometric parameters of the metasurface structure unit, including thickness h , radius R and arrangement period p , the filter range can be flexibly regulated. In addition, the reversible switching between the amorphous phase and the crystal phase of ITO can be driven by external excitation, so that the filter range of the device can be switched, and dynamic regulation between the two wave bands of 6-7 mu m and 8-10 mu m can be realized.

The present disclosure provides a tunable photogenerated microwave source system, which relates to the field of photogenerated microwave technology, and includes: an optical heterodyne module, which is used to generate a microwave signal using an output laser beam based on an optical heterodyne method; a frequency stabilization and frequency measurement module, which is used to modulate the microwave signal into a light wave containing a negative first-order sideband, and then split the light wave into two paths and measure the relationship between the power ratio of the two paths of light waves and the frequency; a feedback control module, which is used to calculate the actual frequency value of the microwave signal according to the relationship between the power ratio and the frequency, compare the actual frequency value with the preset frequency value of the microwave signal, and adjust the laser beam frequency according to the comparison result, so that the actual frequency value of the microwave signal output by the optical heterodyne module is equal to the preset frequency value. Based on the tunable photogenerated microwave source system, microwave signals can be tuned in a large range, and microwave signals with high frequency stability can be generated.