Characterizing conical refraction optical tweezers

Craig McDonald; Craig McDougall; Edik U. Rafailov; David McGloin

doi:10.1364/OL.39.006691

Characterizing conical refraction optical tweezers

Craig McDonald (Lead / Corresponding author)
, Craig McDougall
, Edik U. Rafailov
, David McGloin

Physics

Research output: Contribution to journal › Article › peer-review

18 Citations (Scopus)

Abstract

Conical refraction occurs when a beam of light travels through an appropriately cut biaxial crystal. By focussing the conically refracted beam through a high numerical aperture microscope objective, conical refraction optical tweezers can be created, allowing for particle manipulation in both Raman spots and in the Lloyd/Poggendorff rings. We present a thorough quantification of the trapping properties of such a beam, focussing on the trap stiffness and how this varies with trap power and trapped particle location. We show that the lower Raman spot can be thought of as a single-beam optical gradient force trap, while radiation pressure dominates in the upper Raman spot, leading to optical levitation rather than trapping. Particles in the Lloyd/Poggendorff rings experience a lower trap stiffness than particles in the lower Raman spot but benefit from rotational control

Original language	English
Pages (from-to)	6691-6694
Number of pages	5
Journal	Optics Letters
Volume	39
Issue number	23
Early online date	24 Oct 2014
DOIs	https://doi.org/10.1364/OL.39.006691
Publication status	Published - 2014

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Applications of Optical Manipulation for Low Cost Implementation, Beam Shaping and Biophysical Force Measurements
McDonald, C. (Author), McGloin, D. (Supervisor) & Fagerholm, S. (Supervisor), 2017
Student thesis: Doctoral Thesis › Doctor of Philosophy

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title = "Characterizing conical refraction optical tweezers",

abstract = "Conical refraction occurs when a beam of light travels through an appropriately cut biaxial crystal. By focussing the conically refracted beam through a high numerical aperture microscope objective, conical refraction optical tweezers can be created, allowing for particle manipulation in both Raman spots and in the Lloyd/Poggendorff rings. We present a thorough quantification of the trapping properties of such a beam, focussing on the trap stiffness and how this varies with trap power and trapped particle location. We show that the lower Raman spot can be thought of as a single-beam optical gradient force trap, while radiation pressure dominates in the upper Raman spot, leading to optical levitation rather than trapping. Particles in the Lloyd/Poggendorff rings experience a lower trap stiffness than particles in the lower Raman spot but benefit from rotational control",

author = "Craig McDonald and Craig McDougall and Rafailov, \{Edik U.\} and David McGloin",

year = "2014",

doi = "10.1364/OL.39.006691",

language = "English",

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AU - McDonald, Craig

AU - McDougall, Craig

AU - Rafailov, Edik U.

AU - McGloin, David

PY - 2014

Y1 - 2014

N2 - Conical refraction occurs when a beam of light travels through an appropriately cut biaxial crystal. By focussing the conically refracted beam through a high numerical aperture microscope objective, conical refraction optical tweezers can be created, allowing for particle manipulation in both Raman spots and in the Lloyd/Poggendorff rings. We present a thorough quantification of the trapping properties of such a beam, focussing on the trap stiffness and how this varies with trap power and trapped particle location. We show that the lower Raman spot can be thought of as a single-beam optical gradient force trap, while radiation pressure dominates in the upper Raman spot, leading to optical levitation rather than trapping. Particles in the Lloyd/Poggendorff rings experience a lower trap stiffness than particles in the lower Raman spot but benefit from rotational control

AB - Conical refraction occurs when a beam of light travels through an appropriately cut biaxial crystal. By focussing the conically refracted beam through a high numerical aperture microscope objective, conical refraction optical tweezers can be created, allowing for particle manipulation in both Raman spots and in the Lloyd/Poggendorff rings. We present a thorough quantification of the trapping properties of such a beam, focussing on the trap stiffness and how this varies with trap power and trapped particle location. We show that the lower Raman spot can be thought of as a single-beam optical gradient force trap, while radiation pressure dominates in the upper Raman spot, leading to optical levitation rather than trapping. Particles in the Lloyd/Poggendorff rings experience a lower trap stiffness than particles in the lower Raman spot but benefit from rotational control

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DO - 10.1364/OL.39.006691

M3 - Article

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VL - 39

SP - 6691

EP - 6694

JO - Optics Letters

JF - Optics Letters

IS - 23

ER -

Characterizing conical refraction optical tweezers

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Applications of Optical Manipulation for Low Cost Implementation, Beam Shaping and Biophysical Force Measurements

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