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

Autor:	Ming-Hua Mao, You-Ru Lin, Yen-Chih Lin, Lon A. Wang, Hao-Hsiung Lin, Che-An Lin
Rok vydání:	2014
Předmět:	Total internal reflection Materials science business.industry Physics::Optics Carrier lifetime Atomic and Molecular Physics and Optics Switching time Condensed Matter::Materials Science Resonator Optics Femtosecond Optoelectronics Whispering-gallery wave business Refractive index Ultrashort pulse
Zdroj:	Optics letters. 39(17)
ISSN:	1539-4794
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6c70c05782908d1aa20f2476eb800437 https://pubmed.ncbi.nlm.nih.gov/25166058 Zobrazit plný text záznamu