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Ultrafast optical control of group delay of narrow-band terahertz waves.
- Source :
-
Scientific Reports . 2/14/2014, p1-5. 5p. - Publication Year :
- 2014
-
Abstract
- We experimentally demonstrate control over the group delay of narrow-band (quasi continuous wave) terahertz (THz) pulses with constant amplitude based on optical switching of a metasurface characteristic. The near-field coupling between resonant modes of a complementary split ring resonator pair and a rectangular slit show an electromagnetically induced transparency-like (EIT-like) spectral shape in the reflection spectrum of a metasurface. This coupling induces group delay of a narrow-band THz pulse around the resonant frequency of the EIT-like spectrum. By irradiating the metasurface with an optical excitation pulse, the metasurface becomes mirror-like and thus the incident narrow-band THz pulse is reflected without a delay. Remarkably, if we select the appropriate excitation power, only the group delay of the narrow-band THz pulse can be switched while the amplitude is maintained before and after optical excitation. [ABSTRACT FROM AUTHOR]
- Subjects :
- *OPTICAL control
*SUBMILLIMETER waves
*OPTICAL switching
*RESONATORS
*SLOW light
Subjects
Details
- Language :
- English
- ISSN :
- 20452322
- Database :
- Academic Search Index
- Journal :
- Scientific Reports
- Publication Type :
- Academic Journal
- Accession number :
- 95035282
- Full Text :
- https://doi.org/10.1038/srep04346