期刊
PHYSICAL REVIEW LETTERS
卷 127, 期 18, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.127.186803
关键词
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资金
- RNP
- MCTIC under the Brazil 6G project of the Radiocommunication Reference Center (Centro de Referencia em Radiocomunicacoes-CRR) of the National Institute of Telecommunications (Instituto Nacional de Telecomunicacoes-Inatel) , Brazil [01245.010604/2020-14]
- FAPESP [2017/25587-5, 2018/22214-6]
- National Council for Scientific and Technological Development-CNPq [429496/2018-4, 305958/2018-6]
Researchers have designed an all-dielectric platform to optically trap small dielectric nanoparticles without heating the nanostructure in the infrared regime. By creating a strong electromagnetic hot spot, nanoparticles as small as 20 nm can be captured without heating.
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.
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