Gradient forces on double-negative particles in optical tweezers using Bessel beams in the ray optics regime

Autor(es)

Ambrosio, Leonardo A. ^[1] ; Hernandez-Figueroa, Hugo E. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Campinas Unicamp, Sch Elect & Comp Engn FEEC, Dept Microwave & Opt DMO, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Optics Express; v. 18, n. 23, p. 24287-24292, NOV 8 2010.
• Citações Web of Science: 24

Resumo

Gradient forces on double negative (DNG) spherical dielectric particles are theoretically evaluated for v-th Bessel beams supposing geometrical optics approximations based on momentum transfer. For the first time in the literature, comparisons between these forces for double positive (DPS) and DNG particles are reported. We conclude that, contrary to the conventional case of positive refractive index, the gradient forces acting on a DNG particle may not reverse sign when the relative refractive index n goes from vertical bar n vertical bar > 1 to vertical bar n vertical bar < 1, thus revealing new and interesting trapping properties. (C) 2010 Optical Society of America (AU)

• Processo FAPESP: 05/51689-2 - Centro de Pesquisa em Óptica e Fotônica - UNICAMP (CEPOF-UNICAMP)
• Beneficiário: Hugo Luis Fragnito
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• Processo FAPESP: 09/54494-9 - Viabilidade do uso de particulas metamateriais para manipulacao e aprisionamento opticos.
• Beneficiário: Leonardo Andre Ambrosio
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado