2026-06-27T12:26:27Zhttps://docta.ucm.es/rest/oai/requestoai:docta.ucm.es:20.500.14352/346572023-08-27T02:04:30Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense
author
Cox, Joel D.
author
Singh, Mahi R.
author
Antón Revilla, Miguel Ángel
author
Carreño Sánchez, Fernando
2023-06-19T14:54:06Z
2023-06-19T14:54:06Z
2013-08-29
0953-8984
10.1088/0953-8984/25/38/385302
https://hdl.handle.net/20.500.14352/34657
http://dx.doi.org/10.1088/0953-8984/25/38/385302
http://iopscience.iop.org/0953-8984/25/38/385302/
Nonlinear two-photon absorption in a quantum dot–graphene nanoflake nanocomposite system has been investigated. An external laser field is applied to the nanocomposite to simultaneously observe two-photon processes in the quantum dot and excite localized surface plasmons in the graphene nanodisk. This resonance condition can be achieved by tuning the plasmon resonance frequency in the graphene nanoflake via electrostatic gating. It is found that the strong local field of the graphene plasmons can enhance and control nonlinear optical processes in the quantum dot. Specifically, we show that the two-photon absorption coefficient in the quantum dot can be switched between single- and double-peaked spectra by modifying the graphene–quantum dot separation. Two-photon processes in the quantum dot can also be switched on or off by slightly changing the gate voltage applied to the graphene. Our findings indicate that this system can be used for nonlinear optical applications such as all-optical switching, biosensing and signal processing.
eng
Plasmonic control of nonlinear two-photon absorption in graphene nanocomposites
journal article
URL
https://docta.ucm.es/bitstreams/00e3e28c-428a-41e2-990f-84352a5c4e1f/download
File
MD5
e8f7949d4c057ccaa862c4a1b52b9a15
1070890
application/pdf
Plasmonic control of nonlinear.pdf