Effects of disorder on two-photon absorption in amorphous semiconductors

Autor(es)

Dutta, Nikita S. ^[1] ; Almeida, Juliana M. P. ^{[2, 3]} ; Mendonca, Cleber R. ^[2] ; Arnold, Craig B. ^{[1, 4]}

Afiliação do(s) autor(es)

^[1] Princeton Univ, Princeton Inst Sci & Technol Mat, Dept Mech & Aerosp Engn, Princeton, NJ 08544 - USA

^[2] Univ Sao Paulo, Sao Carlos Inst Phys, BR-13560970 Sao Carlos, SP - Brazil

^[3] Univ Sao Paulo, Dept Mat Engn, Sao Carlos Sch Engn, BR-13563120 Sao Carlos, SP - Brazil

^[4] Almeida, Juliana M. P., Univ Sao Paulo, Dept Mat Engn, Sao Carlos Sch Engn, BR-13563120 Sao Carlos, SP, Brazil.Dutta, Nikita S., Princeton Univ, Princeton Inst Sci & Technol Mat, Dept Mech & Aerosp Engn, Princeton, NJ 08544 - USA

• Tipo de documento: Artigo Científico
• Fonte: OPTICS LETTERS; v. 45, n. 12 JUN 15 2020.
• Citações Web of Science: 0

Resumo

Structural disorder inherent to amorphous materials affords them unique, tailorable properties desirable for diverse applications, but our ability to exploit these phenomena is limited by a lack of understanding of complex structure-property relationships. Here we focus on nonlinear optical absorption and derive a relationship between disorder and the two-photon absorption (2PA) coefficient. We employ an open-aperture Z-scan to measure the 2PA spectra of arsenic (III) sulfide (As2S3) chalcogenide glass films processed with two solvents that impart different levels of structural disorder. We find that the effect of solvent choice on 2PA depends on the energy of the exciting photons and explain this as a consequence of bonding disorder and electron state localization. Our results demonstrate how optical nonlinearities in As2S3 can be enhanced through informed processing and present a fundamental relationship between disorder and 2PA for a generalized amorphous solid. (C) 2020 Optical Society of America (AU)

• Processo FAPESP: 18/11283-7 - Fotônica não linear: espectroscopia e processamento avançado de materiais
• Beneficiário: Cleber Renato Mendonça
• Modalidade de apoio: Auxílio à Pesquisa - Temático