Nonlinear THz mixing in YBaCuO thin film hot electron bolometers

Mark Lee; Chao Te Li; Bascom S. Deaver Jr.; Robert M. Weikle II; Rajesh A. Rao; Chang-Beom Eom

doi:10.1117/12.335898

22 December 1998 Nonlinear THz mixing in YBa₂Cu₃O₇ thin film hot electron bolometers

Mark Lee, Chao Te Li, Bascom S. Deaver Jr., Robert M. Weikle II, Rajesh A. Rao, Chang-Beom Eom

Proceedings Volume 3481, Superconducting and Related Oxides: Physics and Nanoengineering III; (1998) https://doi.org/10.1117/12.335898
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

Small volume high-T_c super-conducting YBa₂Cu₃O₇ (YBCO) thin films are used as low power, very wide bandwidth mixers in the frequency range of 75 GHz to 2.5 THz. The YBCO films are patterned into lattice-cooled hot-electron bolometers (HEB) coupled to an integrated Au thin-film antenna and transmission line. Near 77 K, these mixers have responsivity as high as 780 V/W using only 8 nW of local oscillator (LO) power at 585 GHz. The responsivity can be shown to be truly bolometric. Direct heterodyne and homodyne down-conversion mixing using local-oscillator frequencies of 75 GHz and 585 GHz show overall conversion gains of -35 dB, which includes a -18 dB coupling loss, using only approximately 1 (mu) W of LO power. The gain bandwidth shows a simple Lorentzian roll-off with -3 dB point of 5 to 8 GHz. The large gain bandwidth and small power requirements make these high-T_c superconducting mixers an attractive alternative to existing Schottky diode and conventional superconducting receiver technologies.

Citation Download Citation

Mark Lee, Chao Te Li, Bascom S. Deaver Jr., Robert M. Weikle II, Rajesh A. Rao, and Chang-Beom Eom "Nonlinear THz mixing in YBa₂Cu₃O₇ thin film hot electron bolometers", Proc. SPIE 3481, Superconducting and Related Oxides: Physics and Nanoengineering III, (22 December 1998); https://doi.org/10.1117/12.335898

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