Beyond Universal Volume Scaling: Tailoring Two-Photon Absorption in Nanomaterials by Heterostructure Design

Autor(es)

Alo, Arthur ; Barros, Leonardo W. T. ; Nagamine, Gabriel ; Lemus, Jonathan C. ; Planelles, Josep ; Movilla, Jose L. ; Climente, Juan I. ; Lee, Hak June ; Bae, Wan Ki ; Padilha, Lazaro A.

• Tipo de documento: Artigo Científico
• Fonte: Nano Letters; v. 23, n. 15, p. 8-pg., 2023-07-28.

Resumo

Colloidal semiconductor nanomaterials present broadband,with largecross-section, two-photon absorption (2PA) spectra, which turn theminto an important platform for applications that benefit from a highnonlinear optical response. Despite that, to date, the only meansto control the magnitude of the 2PA cross-section is by changing thenanoparticle volume, as it follows a universal volume scale, independentof the material composition. As the emission spectrum is connectedutterly to the nanomaterial dimensions, for a given material, themagnitude of the nonlinear optical response is also coupled to theemission spectra. Here, we demonstrate a means to decouple both effectsby exploring the 2PA response of different types of heterostructures,tailoring the volume dependence of the 2PA cross-section due to thedifferent dependence of the density of final states on the nanoparticlevolume. By heterostructure engineering, one can obtain 1 order ofmagnitude enhancement of the 2PA cross-section with minimum emissionspectra shift. (AU)

• Processo FAPESP: 18/15574-6 - Espectroscopia avançada de nanomateriais: de suspensões coloidais à partícula única
• Beneficiário: Lázaro Aurélio Padilha Junior
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores - Fase 2
• Processo FAPESP: 18/25339-4 - Dispositivos fotônicos integrados
• Beneficiário: Newton Cesario Frateschi
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 19/22823-5 - Processos de dois-fótons em semicondutores com confinamento quântico
• Beneficiário: Arthur Aló de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Mestrado