Optical tweezers and optical spanners with Laguerre–Gaussian modes

Autor:	N. B. Simpson, Miles J. Padgett, L. Allen
Rok vydání:	1996
Předmět:	Physics Angular momentum Angular acceleration business.industry Physics::Optics Angular velocity Rotation Laser Atomic and Molecular Physics and Optics law.invention Optics Optical tweezers law Laser power scaling Atomic physics business Absorption (electromagnetic radiation)
Zdroj:	Journal of Modern Optics. 43:2485-2491
ISSN:	1362-3044 0950-0340
DOI:	10.1080/09500349608230675
Popis:	We numerically model the axial trapping forces within optical tweezers arising from Laguerre–Gaussian laser modes. For an 8 μm diameter sphere suspended in water, the higher-order modes produce an axial trapping force several times larger than that of the fundamental. Partial absorption results in a transfer of the orbital angular momentum from the Laguerre–Gaussian mode to the trapped particle. This results in the rotation of the particle by what may be called an optical spanner (wrench). For an absorption coefficient of α = 5700 m−1 and a laser power of 10 mW, we find that an 8 μm diameter sphere would acquire an angular acceleration of 10 × 104 rad s−2 and a limiting angular velocity of 0.2 rad s−1.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::82aaa6e39dfade589c12190977bd88f5 https://doi.org/10.1080/09500349608230675 Zobrazit plný text záznamu