Low-Temperature Noise Performance of SuperSpec and Other Developments on the Path to Deployment
Low-Temperature Noise Performance of SuperSpec and Other Developments on the Path to Deployment
复制标题
SuperSpec 的低温噪声性能以及部署过程中的其他进展
DOI：
10.1007/s10909-018-2061-6
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发表时间：
2018
影响因子：
2
通讯作者：
J. Zmuidzinas
中科院分区：
文献类型：
--
作者：
R. McGeehan;Peter S. Barry;E. Shirokoff;C. M. Bradford;G. Che;Jason Glenn;S. Gordon;S. Hailey;M. Hollister;Attila Kovacs;Henry G. Leduc;P. Mauskopf;C. Mckenney;T. Reck;J. Redford;C. Tucker;J. Turner;S. Walker;J. Wheeler;J. Zmuidzinas
SuperSpec is a compact on-chip spectrometer operating at mm and sub-mm wavelengths which will enable the construction of sensitive multibeam spectrometers. SuperSpec employs a filter bank architecture, consisting of lithographically patterned niobium superconducting microstrip mm-wave resonators. The power admitted by each resonator is detected by a titanium nitride lumped-element kinetic inductance detector (KID) with resonant frequency from 100 to 200 MHz. We present a characterization of the detector noise performance down to 10 mK measured in a dark setting. We report a device NEP of $$2.7 \times 10^{-18}\, \hbox {W Hz}^{-1/2}$$2.7×10-18WHz-1/2 at 210 mK, which is below the expected photon noise level at high-altitude ground-based observatories. The NEP decreases to a constant value of approximately $$7.0 \times 10^{-19}\, \hbox {W Hz}^{-1/2}$$7.0×10-19WHz-1/2 below 130 mK. The white noise is well modeled by thermal generation–recombination noise (GR noise) down to 130 mK and a noise floor at low temperatures. Moreover, the addition of low-pass coaxial filters further reduces the noise floor to achieve an NEP of $$5.7 \times 10^{-19} \,\hbox {W Hz}^{-1/2}$$5.7×10-19WHz-1/2 below 100 mK. We discuss a photolithographic technique to adjust KID resonances that results in an $$f_{0}$$f0 designed versus measured scatter of $$1.7 \times 10^{-5}$$1.7×10-5, which will allow a significant reduction in resonators lost to clashes in full-scale designs. Finally, we present a demonstration of a new ROACH-2-based readout system operating below 500 MHz and show preliminary data indicating the suitability of this system for future highly multiplexed KID arrays.
SuperSpec is a compact on-chip spectrometer operating at mm and sub-mm wavelengths which will enable the construction of sensitive multibeam spectrometers. SuperSpec employs a filter bank architecture, consisting of lithographically patterned niobium superconducting microstrip mm-wave resonators. The power admitted by each resonator is detected by a titanium nitride lumped-element kinetic inductance detector (KID) with resonant frequency from 100 to 200 MHz. We present a characterization of the detector noise performance down to 10 mK measured in a dark setting. We report a device NEP of $$2.7 \times 10^{-18}\, \hbox {W Hz}^{-1/2}$$2.7×10-18WHz-1/2 at 210 mK, which is below the expected photon noise level at high-altitude ground-based observatories. The NEP decreases to a constant value of approximately $$7.0 \times 10^{-19}\, \hbox {W Hz}^{-1/2}$$7.0×10-19WHz-1/2 below 130 mK. The white noise is well modeled by thermal generation–recombination noise (GR noise) down to 130 mK and a noise floor at low temperatures. Moreover, the addition of low-pass coaxial filters further reduces the noise floor to achieve an NEP of $$5.7 \times 10^{-19} \,\hbox {W Hz}^{-1/2}$$5.7×10-19WHz-1/2 below 100 mK. We discuss a photolithographic technique to adjust KID resonances that results in an $$f_{0}$$f0 designed versus measured scatter of $$1.7 \times 10^{-5}$$1.7×10-5, which will allow a significant reduction in resonators lost to clashes in full-scale designs. Finally, we present a demonstration of a new ROACH-2-based readout system operating below 500 MHz and show preliminary data indicating the suitability of this system for future highly multiplexed KID arrays.