Opto-thermoelectric nanotweezers.

Opto-thermoelectric nanotweezers.
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DOI:
10.1038/s41566-018-0134-3
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发表时间:
2018-04
期刊:
影响因子:
35
通讯作者:
Zheng Y
Zheng Y
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Lin L;Wang M;Peng X;Lissek EN;Mao Z;Scarabelli L;Adkins E;Coskun S;Unalan HE;Korgel BA;Liz-Marzán LM;Florin EL;Zheng Y

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Optical manipulation of plasmonic nanoparticles provides opportunities for fundamental and technical innovation in nanophotonics. Optical heating arising from the photon-to-phonon conversion is considered as an intrinsic loss in metal nanoparticles, which limits their applications. We show here that this drawback can be turned into an advantage, by developing an extremely low-power optical tweezing technique, termed opto-thermoelectric nanotweezers (OTENT). Through optically heating a thermoplasmonic substrate, alight-directed thermoelectric field can be generated due to spatial separation of dissolved ions within the heating laser spot, which allows us to manipulate metal nanoparticles of a wide range of materials, sizes and shapes with single-particle resolution. In combination with dark-field optical imaging, nanoparticles can be selectively trapped and their spectroscopic response can be resolved in-situ. With its simple optics, versatile low-power operation, applicability to diverse nanoparticles, and tuneable working wavelength, OTENT will become a powerful tool in colloid science and nanotechnology.
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