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Type of Publication: | Journal article |
Publication status: | Published |
URI (citable link): | http://nbn-resolving.de/urn:nbn:de:bsz:352-2-1uq0z3hugfq4n9 |
Author: | Li, Changxiu; Gusev, Vitalyi; Dimakis, Emmanouil; Dekorsy, Thomas; Hettich, Mike |
Year of publication: | 2019 |
Published in: | Applied Sciences ; 9 (2019), 2. - 289. - eISSN 2076-3417 |
DOI (citable link): | https://dx.doi.org/10.3390/app9020289 |
Summary: |
A multiple quantum-well semiconductor saturable absorber mirror (MQW-SESAM) structure has been investigated by femtosecond pump-probe laser spectroscopy at a central wavelength of around 1050 nm. Coherent acoustic phonons are generated and detected over a wide frequency range from ~15 GHz to ~800 GHz. In the optical absorption region, i.e., in the multiple quantum wells (In0.27Ga0.73As), acoustic frequency combs centered at ~365 GHz, with a comb spacing of ~33 GHz, are generated. Most importantly, in the transparent region, i.e., in the distributed Bragg reflector, which is formed by a non-doped long-period semiconductor GaAs/Al0.95Ga0.05As superlattice, the mini-Brillouin-zone center, as well as zone-edge acoustic modes, are observed. The mini-zone-center modes with a fundamental frequency of 32 GHz can be attributed to the spatial modulation of the pump optical interference field with a period very close to that of the distributed Bragg reflector, in combination with the periodic spatial modulation of the electrostriction coefficient in the distributed Bragg reflector. The excitation of mini-zone-edge modes is attributed to the stimulated subharmonic decay of the fundamental center modes. Their subsequent back-folding to the mini-Brillouin-zone center makes them Raman active for the probe light.
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Subject (DDC): | 530 Physics |
Keywords: | coherent acoustic phonons; pump-probe spectroscopy; quantum well; semiconductor superlattice; mini-Brillouin-zone; high-speed asynchronous optical sampling |
Link to License: | Attribution 4.0 International |
Bibliography of Konstanz: | Yes |
Refereed: | Unknown |
LI, Changxiu, Vitalyi GUSEV, Emmanouil DIMAKIS, Thomas DEKORSY, Mike HETTICH, 2019. Broadband Photo-Excited Coherent Acoustic Frequency Combs and Mini-Brillouin-Zone Modes in a MQW-SESAM Structure. In: Applied Sciences. 9(2), 289. eISSN 2076-3417. Available under: doi: 10.3390/app9020289
@article{Li2019-01-15Broad-45498, title={Broadband Photo-Excited Coherent Acoustic Frequency Combs and Mini-Brillouin-Zone Modes in a MQW-SESAM Structure}, year={2019}, doi={10.3390/app9020289}, number={2}, volume={9}, journal={Applied Sciences}, author={Li, Changxiu and Gusev, Vitalyi and Dimakis, Emmanouil and Dekorsy, Thomas and Hettich, Mike}, note={Article Number: 289} }
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