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Optics Letters

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  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 17 — Sep. 1, 2014
  • pp: 4998–5001

All-optical switching in GaAs microdisk resonators by a femtosecond pump–probe technique through tapered-fiber coupling

Yen-Chih Lin, Ming-Hua Mao, You-Ru Lin, Hao-Hsiung Lin, Che-An Lin, and Lon A. Wang  »View Author Affiliations


Optics Letters, Vol. 39, Issue 17, pp. 4998-5001 (2014)
http://dx.doi.org/10.1364/OL.39.004998


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Abstract

We demonstrate ultrafast all-optical switching in GaAs microdisk resonators using a femtosecond pump–probe technique through tapered-fiber coupling. The temporal tuning of the resonant modes resulted from the refractive index change due to photoexcited carrier density variation inside the GaAs microdisk resonator. Transmission through the GaAs microdisk resonator can be modulated by more than 10 dB with a switching time window of 8 ps in the switch-off operation using pumping pulses with energies as low as 17.5 pJ. The carrier lifetime was fitted to be 42 ps, much shorter than that of the bulk GaAs, typically of the order of nanoseconds. The above observation indicates that the surface recombination plays an important role in increasing the switching speed.

© 2014 Optical Society of America

OCIS Codes
(230.1150) Optical devices : All-optical devices
(230.4110) Optical devices : Modulators
(230.5750) Optical devices : Resonators
(320.5390) Ultrafast optics : Picosecond phenomena

ToC Category:
Optical Devices

History
Original Manuscript: June 17, 2014
Manuscript Accepted: July 7, 2014
Published: August 18, 2014

Citation
Yen-Chih Lin, Ming-Hua Mao, You-Ru Lin, Hao-Hsiung Lin, Che-An Lin, and Lon A. Wang, "All-optical switching in GaAs microdisk resonators by a femtosecond pump–probe technique through tapered-fiber coupling," Opt. Lett. 39, 4998-5001 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-17-4998


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