Femtosecond pump-probe and four-wave mixing studies of excitons in GaN

Young-Dahl Jho; Dai-sik Kim; Arthur J. Fischer; Jin-Joo Song; J. Kenrow; K. El Sayed; Christopher J. Stanton

doi:10.1117/12.381469

28 March 2000 Femtosecond pump-probe and four-wave mixing studies of excitons in GaN

Young-Dahl Jho, Dai-sik Kim, Arthur J. Fischer, Jin-Joo Song, J. Kenrow, K. El Sayed, Christopher J. Stanton

Proceedings Volume 3940, Ultrafast Phenomena in Semiconductors IV; (2000) https://doi.org/10.1117/12.381469
Event: Symposium on Integrated Optoelectronics, 2000, San Jose, CA, United States

Abstract

Femtosecond pump-probe (P-P) and four-wave mixing (FWM) experiments were performed simultaneously at 11 K on gallium nitride epilayers to study the initial temporal line-shapes of the exciton. A-B exciton beats were found in both P-P and FWM experiments near the exciton resonance. However, the differential reflection spectra showed a much slower rise time that persisted at longer negative time delay than the FWM signal or differential transition spectra at the exciton resonance. A numerical solution of a six band semiconductor Bloch equation model including all Hartree Fock nonlinearities shows that this slow rise results from excitation induced dephasing, that is, the strong density dependence of the dephasing time which changes with the laser excitation energy.

Citation Download Citation

Young-Dahl Jho, Dai-sik Kim, Arthur J. Fischer, Jin-Joo Song, J. Kenrow, K. El Sayed, and Christopher J. Stanton "Femtosecond pump-probe and four-wave mixing studies of excitons in GaN", Proc. SPIE 3940, Ultrafast Phenomena in Semiconductors IV, (28 March 2000); https://doi.org/10.1117/12.381469

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available