Three-photon absorption spectra and bandgap scaling in direct-gap semiconductors
نویسندگان
چکیده
منابع مشابه
Extremely nondegenerate two-photon absorption in direct-gap semiconductors [Invited].
Two-photon absorption (2PA) spectra with pairs of extremely nondegenerate photons are measured in several direct-gap semiconductors (GaAs, CdTe, ZnO, ZnS and ZnSe) using picosecond or femtosecond pulses. In ZnSe, using photons with a ratio of energies of ~12, we obtain a 270-fold enhancement of 2PA when comparing to the corresponding degenerate 2PA coefficient at the average photon energy (ηω1 ...
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We calculate the spectrum of three-photon absorption (3PA) in zinc blende semiconductors using Kane's four-band model. We apply this to ZnSe and measure the 3PA spectrum using femtosecond pulses, obtaining excellent agreement. The spectrum shows the apparent onset of 3PA from the split-off band and also shows quantum interference between the several possible evolution pathways when exciting car...
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Fig1: (a) Femtosecond pump-probe results: D and ND 2PA coefficient of ZnSe versus the sum of pump and probe photon energies normalized to the bandgap: solid lines are theoretical model. (b) Log-log plot of the output voltage of a GaN diode vs. 5.6 μm (215 fs) input signal energy in the presence of temporally overlapped 390 nm gating pulses (100 fs) of various energies. The grey filled in square...
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Identifying strong and fast nonlinearities for today’s photonic applications is an ongoing effort1. Materials2–5 and devices6–9 are typically sought to achieve increasing nonlinear interactions. We report large enhancement of two-photon absorption through intrinsic resonances using extremely non-degenerate photon pairs. We experimentally demonstrate two-photon absorption enhancements by factors...
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ژورنال
عنوان ژورنال: Optica
سال: 2020
ISSN: 2334-2536
DOI: 10.1364/optica.396056