An optically controllable terahertz filter

Citation
Ih. Libon et al., An optically controllable terahertz filter, APPL PHYS L, 76(20), 2000, pp. 2821-2823
Citations number
19
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
APPLIED PHYSICS LETTERS
ISSN journal
0003-6951 → ACNP
Volume
76
Issue
20
Year of publication
2000
Pages
2821 - 2823
Database
ISI
SICI code
0003-6951(20000515)76:20<2821:AOCTF>2.0.ZU;2-X
Abstract
Using a mixed type-I/type-II GaAs/AlAs multiple-quantum-well sample, we hav e demonstrated an optically controllable and tunable terahertz (THz) filter . Long-lived electron-hole pairs in the quantum wells allow for efficient T Hz attenuation over a large THz spot size (2 mm) for extremely low optical cw power. This sample can also be used as an optically tunable THz phase sh ifter. The optically induced change of the GaAs quantum wells from a dielec tric to a conducting material leads to the observed attenuation and the shi fting of the THz wave forms. (C) 2000 American Institute of Physics. [S0003 -6951(00)02920-X].