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Pàgina inicial > Articles > Articles publicats > Properties of nanocrystalline silicon probed by optomechanics |
Data: | 2020 |
Resum: | Nanocrystalline materials exhibit properties that can differ substantially from those of their single crystal counterparts. As such, they provide ways to enhance and optimize their functionality for devices and applications. Here, we report on the optical, mechanical and thermal properties of nanocrystalline silicon probed by means of optomechanical nanobeams to extract information of the dynamics of optical absorption, mechanical losses, heat generation and dissipation. The optomechanical nanobeams are fabricated using nanocrystalline films prepared by annealing amorphous silicon layers at different temperatures. The resulting crystallite sizes and the stress in the films can be controlled by the annealing temperature and time and, consequently, the properties of the films can be tuned relatively freely, as demonstrated here by means of electron microscopy and Raman scattering. We show that the nanocrystallite size and the volume fraction of the grain boundaries play a key role in the dissipation rates through nonlinear optical and thermal processes. Promising optical (13,000) and mechanical (1700) quality factors were found in the optomechanical cavity realized in the nanocrystalline Si resulting from annealing at 950°C. The enhanced absorption and recombination rates via the intragap states and the reduced thermal conductivity boost the potential to exploit these nonlinear effects in applications including Nanoelectromechanical systems (NEMS), phonon lasing and chaos-based devices. |
Ajuts: | European Commission 713450 Ministerio de Ciencia e Innovación PGC2018-101743-B-I00 Ministerio de Ciencia e Innovación PGC2018-094490-B-C22 Ministerio de Economía y Competitividad SEV-2017-0706 Ministerio de Ciencia e Innovación RYC-2014-15392 |
Drets: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió publicada |
Matèria: | Annealing ; Cavity optomechanics ; Nanocrystalline silicon |
Publicat a: | Nanophotonics, Vol. 9, issue 16 (Nov. 2020) , p. 4819-4829, ISSN 2192-8614 |
11 p, 3.3 MB |