Toward Lossless Infrared Optical Trapping of Small Nanoparticles Using Nonradiative Anapole Modes

Autor(es)

Hernandez-Sarria, J. J. ^[1] ; Oliveira Jr, Osvaldo N. ; Mejia-Salazar, J. R. ^[2]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Fis Sao Carlos, CP 369, BR-13560970 Sao Carlos, SP - Brazil

^[2] Inst Nacl Telecomunicacoes Inatel, BR-37540000 Santa Rita Do Sapucai, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Physical Review Letters; v. 127, n. 18 OCT 26 2021.
• Citações Web of Science: 0

Resumo

A challenge in plasmonic trapping of small nanoparticles is the heating due to the Joule effect of metallic components. This heating can be avoided with electromagnetic field confinement in high-refractive-index materials, but nanoparticle trapping is difficult because the electromagnetic fields are mostly confined inside the dielectric nanostructures. Herein, we present the design of an all-dielectric platform to capture small dielectric nanoparticles without heating the nanostructure. It consists of a Si nanodisk engineered to exhibit the second-order anapole mode at the infrared regime (.1 = 980 nm), where Si has negligible losses, with a slot at the center. A strong electromagnetic hot spot is created, thus allowing us to capture nanoparticles as small as 20 nm. The numerical calculations indicate that optical trapping in these all-dielectric nanostructures occurs without heating only in the infrared, since for visible wavelengths the heating levels are similar to those in plasmonic nanostructures. (AU)

• Processo FAPESP: 18/22214-6 - Rumo à convergência de tecnologias: de sensores e biossensores à visualização de informação e aprendizado de máquina para análise de dados em diagnóstico clínico
• Beneficiário: Osvaldo Novais de Oliveira Junior
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 17/25587-5 - Projeto numérico de pinças ópticas nanofotônicas totalmente dielétricas para manipulação sem perdas de pequenas nanopartículas
• Beneficiário: Jhon James Hernández Sarria
• Modalidade de apoio: Bolsas no Brasil - Doutorado