Metallic particle manipulation with adjustable trapping range through customized field

Bai, Zhidong; Zhang, Shuoshuo; Lyu, Yudong; Zhao, Rui; Yue, Xifu; Xia, Ge; Fu, Shenggui; Man, Zhongsheng

doi:10.1016/j.optcom.2020.126045

Cited by 8 publications

(3 citation statements)

References 41 publications

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“…For the NP, the optical force is described by the dipole model as − ⟨ F ⟩ = 1 4 italicRe ( α ) nobreak∇ false| boldE false| 2 + σ 2 normalc italicRe ( E × H * ) + σ 2 italicRe { i ε k false( boldE · ∇ false) E * } where α is the polarizability of the particle, σ is the cross-section for extinction, k is the wavenumber, E and H are the electric and magnetic vectors, c is the light speed in a vacuum, and ε is permittivity of the medium.…”

Section: Methodsmentioning

confidence: 99%

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Plasmonic-Thermoelectric Nanotweezers for Immersive SERS Mapping

Wang

Zhang

et al. 2022

ACS Nano

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Surface-enhanced Raman spectroscopy (SERS) technology usually uses metallic nanoparticles to enhance Raman scattering signals, thereby significantly adding to molecule-level recognition and detection. However, realization of nanometer-scaled SERS imaging in liquid environments is extremely difficult due to the requirements of both precise scanning of single metallic nanoparticle and high enhancement field and thus has never been achieved before. To overcome this obstacle, we demonstrate an immersive nanometer-scaled SERS mapping technology, based on dynamic scanning of a single metallic nanoparticle with a plasmonic-thermoelectric nanotweezers system. The technology offers greater stability in the plasmonic trapping of gold nanoparticles at relative low power, as well as generating higher electric fields in the gap region. Through its dynamics, two-dimensional nanometer-scaled SERS imaging is achieved successfully. In regard to in liquid environments, this technology provides a mapping method for label-free imaging of ultrathin materials, structures, and biological samples.

show abstract

Section: Methodsmentioning

confidence: 99%

“…For the NP, the optical force is described by the dipole model as − where α is the polarizability of the particle, σ is the cross-section for extinction, k is the wavenumber, E and H are the electric and magnetic vectors, c is the light speed in a vacuum, and ε is permittivity of the medium.…”

Section: Methodsmentioning

confidence: 99%

Plasmonic-Thermoelectric Nanotweezers for Immersive SERS Mapping

Wang

Zhang

et al. 2022

ACS Nano

View full text Add to dashboard Cite

show abstract

“…Since the first practical laser traps of micrometer sized particles demonstrated by Ashkin in 1970 [1], optical tweezer has become powerful tools to capture and manipulate various objects, arising from its unique noncontact and noninvasive advantages [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Recently, light-induced rotation [20][21][22][23][24][25] attracts great attentions due to some practical and useful applications ranging from micro-rotors [26] to optical spanners [27], as well as cell orientation [28] and photonic devices [10].…”

Section: Introductionmentioning

confidence: 99%