Low noise terahertz MgB2 hot-electron bolometer mixers with an 11 GHz bandwidth | Zendy

Evgenii Novoselov | Zendy; Serguei Cherednichenko | Zendy

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Low noise terahertz MgB2 hot-electron bolometer mixers with an 11 GHz bandwidth

Author(s) -

Evgenii Novoselov,

Serguei Cherednichenko

Publication year - 2017

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4974312

Subject(s) - terahertz radiation , bolometer , noise temperature , optoelectronics , materials science , noise (video) , johnson–nyquist noise , bandwidth (computing) , noise measurement , wideband , physics , optics , phase noise , telecommunications , noise reduction , acoustics , artificial intelligence , detector , computer science , image (mathematics)

Terahertz (THz) hot-electron bolometer mixers reach a unique combination of low noise, wide noise bandwidth, and high operation temperature when 6nm thick superconducting MgB2 films are used. We obtained a noise bandwidth of 11GHz with a minimum receiver noise temperature of 930K with a 1.63THz Local Oscillator (LO) and a 5K operation temperature. At 15K and 20K, the noise temperature is 1100K and 1600K, respectively. From 0.69THz to 1.63THz the receiver noise increases by only 12%. Device current-voltage characteristics are identical when pumped with LOs from 0.69THz up to 2.56THz, and match well with IVs at elevated temperatures. Therefore, the effect of the THz waves on the mixer is totally thermal, due to absorption in the π conduction band of MgB2.

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