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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Hernandez-Sarria, J. J. [1] ; Oliveira Jr, Osvaldo N. ; Mejia-Salazar, J. R. [2]
Total Authors: 3
[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
Total Affiliations: 2
Document type: Journal article
Source: Physical Review Letters; v. 127, n. 18 OCT 26 2021.
Web of Science Citations: 0

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)

FAPESP's process: 18/22214-6 - Towards a convergence of technologies: from sensing and biosensing to information visualization and machine learning for data analysis in clinical diagnosis
Grantee:Osvaldo Novais de Oliveira Junior
Support Opportunities: Research Projects - Thematic Grants
FAPESP's process: 17/25587-5 - Numerical design of all-dielectric nanophotonic optical tweezers for lossless manipulation of small nanoparticles
Grantee:Jhon James Hernández Sarria
Support Opportunities: Scholarships in Brazil - Doctorate