Observation of huge nonlinear absorption enhancement near exciton resonance in GaN

Observation of huge nonlinear absorption enhancement near exciton resonance in GaN

Huge excitonic enhancement of two-photon absorption near the exciton-transition energy was observed in the GaN system. The peak value of the nonlinear absorption coefficient is at least 1500 cm/GW, corresponding to an enhancement factor of >100. The room temperature exciton dephasing time is also...

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Veröffentlicht in:Applied physics letters 2003-10, Vol.83 (15), p.3087-3089
Hauptverfasser: Lin, Kung-Hsuan, Chern, Gia-Wei, Huang, Yin-Chieh, Keller, Stacia, DenBaars, Steven P., Sun, Chi-Kuang
Format: Artikel
Sprache:eng
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Zusammenfassung:Huge excitonic enhancement of two-photon absorption near the exciton-transition energy was observed in the GaN system. The peak value of the nonlinear absorption coefficient is at least 1500 cm/GW, corresponding to an enhancement factor of >100. The room temperature exciton dephasing time is also obtained based on a spectral analysis to be ∼150 fs in bulk GaN, which is close to the exciton ionization time.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.1619218