Gain-assisted optical tweezing of plasmonic and large refractive index microspheres

Autor(es)

Ali, R. ^[1] ; Dutra, R. S. ^[2] ; Pinheiro, F. A. ^[3] ; Maia Neto, P. A. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Gleb Wataghin Phys Inst, Appl Phys Dept, BR-13083859 Campinas, SP - Brazil

^[2] Inst Fed Educ Ciencia & Tecnol, LISComp IFRJ, Rua Sebastiao de Lacerda, BR-26600000 Paracambi, RJ - Brazil

^[3] Univ Fed Rio de Janeiro, Inst Fis, Caixa Postal 68528, BR-21941972 Rio De Janeiro, RJ - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Journal of Optics; v. 23, n. 11 NOV 2021.
• Citações Web of Science: 1

Resumo

We have theoretically investigated optical tweezing of gain-functionalized microspheres using a highly focused single beam in the nonparaxial regime. We employ the Mie-Debye theory of optical tweezers to calculate the optical force acting on homogeneous and core-shell Mie microspheres with gain. We demonstrate that the optical gain plays a crucial role in optical manipulation, especially to optimize the restoring force and thus allowing for trapping of large refractive index and plasmonic particles. Indeed, we demonstrate that one can trap such particles, which is usually not possible in the case of passive media, by functionalizing them with an optical gain material. We show that by varying the value of the gain, which can be realized by changing the pump power, one can not only achieve trapping but also manipulate the equilibrium position of the tweezed particle. Altogether, our findings open new avenues for gain-assisted optomechanics, where gain functionalized systems could facilitate optical trapping and manipulation of plasmonic nanoparticles in particular, with potential applications in self-assembling of nanoparticle suspensions and on a chip. (AU)

• Processo FAPESP: 14/50983-3 - INCT 2014: fluidos complexos
• Beneficiário: Antonio Martins Figueiredo Neto
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 20/03131-2 - Interação entre luz e som em microcavidades ópticas
• Beneficiário: Rfaqat Ali
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado