Optical response of nongranular high- T sub c Y sub 1 Ba sub 2 Cu sub 3 O sub 7 sub minus x superconducting thin films

Journal Article · Thu Mar 15 04:00:00 EST 1990 · Journal of Applied Physics; (USA)

DOI:https://doi.org/10.1063/1.345435· OSTI ID:6977509

Frenkel, A ^[1]; Saifi, M A; Venkatesan, T; England, P ^[2]; Wu, X D; Inam, A ^[3]

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1. Bellcore, Morristown, New Jersey 07960 (US)
2. Bellcore, Red Bank, New Jersey 07701 (USA)
3. Physics Department, Rutgers University, Piscataway, New Jersey 08854 (USA)

We have investigated the optical response of {ital c}-axis oriented crystalline Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 7}{sub {minus}{ital x}} thin films (bridge and meander devices) on strontium titanate and MgO substrates. cw optical response to a He-Ne laser radiation (wavelength of 0.63 {mu}m) was primarily bolometric. The pulsed optical response was studied with {ital Q}-switched and mode-locked {ital Q}-switched short pulses from a Nd:YAG laser at the wavelength of 1.06 {mu}m. We identify two distinct components contributing to the pulsed optical response: a nonbolometric (as fast as 1 ns) and a bolometric component (several ns). The bolometric component is strong at temperatures in the vicinity of the transition region to the normal state. The nonbolometric component is dominant at temperatures below the transition region showing weak temperature dependence and a linear dependence on the bias current. These results are discussed using the flux motion model and also electron-phonon scattering relaxation dynamics of nonequilibrium superconductors based on the theory of Bardeen-Cooper-Schrieffer. The results suggest that with proper optimization of device parameters (geometry, critical current density, etc.) sensitive bolometers and high-speed detectors covering a broad electromagnetic spectrum (visible and infrared) may be developed.

• OSTI ID: 6977509
• Journal Information: Journal of Applied Physics; (USA), Journal Name: Journal of Applied Physics; (USA) Vol. 67:6; ISSN 0021-8979; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
BCS THEORY
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CRYSTALS
ELECTROMAGNETIC RADIATION
ELECTRON-PHONON COUPLING
FILMS
LASER RADIATION
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MAGNETIC FLUX
MATHEMATICAL MODELS
OPTICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PULSES
Q-SWITCHING
RADIATIONS
RELAXATION
SUPERCONDUCTING FILMS
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES