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(a) Array micrograph. Each line of five pixels was designed to occupy a 50 MHz bandwidth. The five labeled pixels were used to measure phonon propagation. (b) LEKID. (c) In-phase (I) and quadrature (Q) transmission amplitudes. The numeric labels correspond to the pixels in (a), the arrows indicate the direction of increasing frequency and the star marks the origin. (d) Total transmitted amplitude for the measurement shown in (c), calculated using .
Electronic readout. A digital-signal processing card is used to frequency-multiplex the resonators. The individual components shown are: (i) high-frequency synthesizer (0.1–8 GHz), (ii) splitter, (iii) mixer, (iv) attenuator, (v) amplifier, and (vi) low-pass filter.
Calibration. (a) The phase as measured around the resonance curve in the IQ plane. The solid curve is a circular fit to the curvature near the resonance. The start (◻) and end (◇) points of the frequency sweep in (b) are displayed. (b) Frequency-dependence of for a 120 kHz sweep around the resonance frequency.
(a) Calibrated high-speed detection of a cosmic event using 5 KIDs. The individual responses are offset by 100 kHz. The dashed vertical line is the time that a resonator trigger level was exceeded, in this case by pixel 1. (b) Zoom of initial rise clearly showing the propagation delay.
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