Superconducting on-chip spectrometers have both imaging and spectroscopic capabilities. In general, the broadband signal coupled from an antenna goes through frequency dispersion via a series of filters that are connected with superconducting detectors like kinetic inductance detectors or bolometers. The filters have the same relative bandwidth, which determines the frequency resolution of the spectrometer. We here present the design and simulations on the twin-slot antenna, CPW-to-microstrip transition, and a ten-channel filter-bank of a verification-stage terahertz spectrometer chip at 350 GHz. The simulation results of the antenna and transition showed low return loss, and the simulation results of the ten-channel filter-bank show that each channel has good readout independence and coupling strength. These designs and simulations can provide assistance for the future development of terahertz on-chip spectrometer.
Microwave kinetic inductance detectors (MKIDs) can detect photons ranging from terahertz, infrared, optical to X-ray frequencies. And it has the advantages of high sensitivity, easy frequency-domain multiplexing (FDM) readout, and simple structure for large-format arrays. With these advantages MKIDs are becoming the choice of incoherent detectors in astronomy such as imaging cameras and broadband imaging spectrometers. In this paper, we introduce the design and fabrication of a 5-THz 10×10 MKIDs array on a single chip from an 80-nm-thick aluminum (Al) superconducting film based on a high resistance silicon substrate. Each pixel is a quarter-wavelength resonator with its short-circuited end integrated with a 5-THz dipole antenna. The noise performance of the MKIDs is measured at 200-mK using both phase readout and amplitude readout, giving an electrical NEP ~10−17 W/Hz0.5. Detailed results will be presented.
Microwave kinetic inductance detectors (MKIDs) are promising low-temperature superconducting detectors because of high sensitivity, easy frequency-domain multiplexing (FDM) readout, and simple structure for large-format arrays. Each pixel of the MKID array is a microwave resonator, and the FDM technology makes the resonant frequencies of all resonators read out by one feedline. However, there are often crossovers, missing, and overlapping phenomena between resonance curves. As a prerequisite for imaging, it is necessary to confirm the correspondence between the resonance frequency point and the physical position of the pixel. In this paper, by designing and using an 8×8 LED dot matrix, a fast pixel recognition of an 8×8 MKID array is realized. In addition, the I-V characteristics of the AlGaInP red Light-emitting diode (LED) used in the experiment at different low temperatures are characterized. Finally, through the MKID that has achieved pixel positioning, and the image of LED multi-point lighting is obtained.
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