Sensitive and fast room temperature THz sensing: a challenge for Y-Ba-Cu-O semiconducting thin films

Annick F. Dégardin; Xavier Galiano; Vishal S. Jagtap; Alain J. Kreisler

doi:10.1117/12.2573730

20 September 2020 Sensitive and fast room temperature THz sensing: a challenge for Y-Ba-Cu-O semiconducting thin films

Annick F. Dégardin, Xavier Galiano, Vishal S. Jagtap, Alain J. Kreisler

Proceedings Volume 11541, Millimetre Wave and Terahertz Sensors and Technology XIII; 115410C (2020) https://doi.org/10.1117/12.2573730
Event: SPIE Security + Defence, 2020, Online Only

Abstract

The well known Y-Ba-Cu-O superconductor (oxygen rich) material also exhibits a semiconducting phase (oxygen depleted), which offers in its amorphous form (a-YBCO), an attractive solution for the easy fabrication of room temperature thermal radiation detectors. The operating mechanism is related to a sensitive pyroelectric response that originates from the permanent dipolar moment of the Y-Ba-Cu-O unit cell. In the first part of this paper, we investigate material aspects of a-YBCO thin films (surface morphology, electrical transport and optical properties) for a better understanding of the microstructure vs. conductivity relationship. In the second part, we report on the near-infrared (NIR) characterization of planar and trilayer detector devices fabricated on silicon substrates. These detectors exhibit a very fast response (time constant tau = 1.9 µs for a planar device; tau = 0.12 µs for a trilayer device) as compared to commercially available pyroelectric sensors. The best noise equivalent power (NEP) and detectivity D*, which are at the state of the art, were observed in the NIR at 10 kHz modulation frequency: NEP = 2.0 pW/rootHz and D* = 6.6×10^9 cm•rootHz/W for planar device; NEP = 2.6 pW/rootHz and D* = 5.7×10^9 cm•rootHz/W for trilayer device. Evolution towards THz detection is finally considered

Conference Presentation

Citation Download Citation

Annick F. Dégardin, Xavier Galiano, Vishal S. Jagtap, and Alain J. Kreisler "Sensitive and fast room temperature THz sensing: a challenge for Y-Ba-Cu-O semiconducting thin films", Proc. SPIE 11541, Millimetre Wave and Terahertz Sensors and Technology XIII, 115410C (20 September 2020); https://doi.org/10.1117/12.2573730

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