Chip circuit for light could be applied to quantum computations NIST NatureComms
c, the Archimedean spirals were designed with a radius of curvature that varied continuously going inwards, from a maximum valuenear the center. The inward spiral was followed by an S-bend with= 500 μm, which transitioned to the outward spiral towards the waveguide output. Time-domain reflectivity traces for the three spirals are shown in Fig. d, as a function of spiral length and RoC. All reflectivity curves are approximately linear up to about half of the total spiral lengths.
Linear losses for 3 m and 2 m spirals were found to be, respectively, dB/m and dB/m. Fits to the 1 m spiral trace did not yield reliable parameters, primarily due to the short extent of the available data.Photograph of an ULLW spiral with 1 m length under test. Scale bar: 5 mm.Schematic of the Archimedean spirals used for loss measurement, composed of inward and outward spirals, connected by an S-bend .
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