Measurement of axial and transverse trapping stiffness of optical tweezers in air using a radially polarized beam

Masaki Michihata, Terutake Hayashi, Yasuhiro Takaya

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

The trapping efficiency and stiffness of optical tweezers using radial polarization are evaluated; the ray-tracing method and a proposed measurement method are used for numerical and experimental analyses, respectively. The maximum axial trapping efficiency with radial polarization is 1.84 times that with linear polarization, while the maximum transverse trapping efficiency decreases by 0.58 times. Further, the axial and transverse trapping efficiencies are found to be 1.19 times larger and 0.83 times smaller, respectively, than the values with linear polarization. From the experiments, the axial and transverse stiffness values are 1.2 times larger and 0.8 times smaller, respectively, with radial polarization. Hence, radial polarization enhances the axial trapping properties while reducing the transverse trapping properties.

Original languageEnglish
Pages (from-to)6143-6151
Number of pages9
JournalApplied Optics
Volume48
Issue number32
DOIs
Publication statusPublished - Nov 10 2009
Externally publishedYes

Fingerprint

Optical tweezers
stiffness
trapping
Stiffness
Polarization
air
Air
polarization
linear polarization
Ray tracing
ray tracing

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

Measurement of axial and transverse trapping stiffness of optical tweezers in air using a radially polarized beam. / Michihata, Masaki; Hayashi, Terutake; Takaya, Yasuhiro.

In: Applied Optics, Vol. 48, No. 32, 10.11.2009, p. 6143-6151.

Research output: Contribution to journalArticle

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