Ultrafast Broadband Photodetectors for High-Tc Superconductive Optoelectronics.
Abstract
The femtosecond optical response of YBCO films has been determined by pump-probe experiments after excitation with ultrashort optical pulses generated by a copper vapor amplified colliding pulse modelocked dye laser. From the results we have obtained as a function of pump intensity, probe wavelength and sample temperature, we find that contrary to the usually accepted interpretation, the position of the Fermi level is not at 2 eV above the copper d-band in oxygen-rich samples (at room temperature) and that the low-temperature optical response is not consistent with the destruction of superconductivity through the destruction of a large density of Cooper pairs via an avalanche process, followed by the restoration of superconductivity on a time scale of several picoseconds. In addition, the laser writing technique has been developed and refined to fabricate simple microbridges in initially oxygen-rich YBCO films.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 12, 1996
- Accession Number
- ADA316750
Entities
People
- P. M. Fauchet
Organizations
- University of Rochester