Engineering phononic cavities: ultrafast phonon and carrier dynamics

Michael P. Nielsen; Muhammad Hanif; Milos Dubajic; Gavin Conibeer; Stephen Bremner

doi:10.1117/12.3001946

9 March 2024 Engineering phononic cavities: ultrafast phonon and carrier dynamics

Michael P. Nielsen, Muhammad Hanif, Milos Dubajic, Gavin Conibeer, Stephen Bremner

Proceedings Volume PC12884, Ultrafast Phenomena and Nanophotonics XXVIII; PC1288408 (2024) https://doi.org/10.1117/12.3001946
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

Materials having tailor-made electronic and phononic properties are vital for energy conversion, thermal management and novel sub-THz applications. To this end, we have demonstrated phonon cavities designed to operate at 96GHz with parabolic, quartic and linear 1D phonon potentials using GaAs/AlAs superlattices. Ultrafast vibrational spectroscopy shows long lived coherent acoustic phonon modes confined by the cavity at room temperature. Moreover, time resolved photoluminescence characterization showed a slow carrier energy loss rate compared to a DBR sample fabricated to exhibit linear phonon dispersion without confinement. These results can help develop new device architectures for applications where phonons either need to be confined or efficiently guided.

Conference Presentation

Citation Download Citation

Michael P. Nielsen, Muhammad Hanif, Milos Dubajic, Gavin Conibeer, and Stephen Bremner "Engineering phononic cavities: ultrafast phonon and carrier dynamics", Proc. SPIE PC12884, Ultrafast Phenomena and Nanophotonics XXVIII, PC1288408 (9 March 2024); https://doi.org/10.1117/12.3001946

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