Coherent oscillations of a birefringent microsphere in vacuum optical traps

Yoshihiko Arita; Stephen H. Simpson; Pavel Zemánek; Kishan Dholakia

doi:10.1117/12.2573530

Coherent oscillations of a birefringent microsphere in vacuum optical traps

Yoshihiko Arita, Stephen H. Simpson, Pavel Zemánek, Kishan Dholakia

Department of Physics

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

Abstract

When particles are held in optical tweezers, we assume that they are in thermal equilibrium, in which the equipartition of energy determines the position variance of optically trapped spheres. Here we show that this condition only holds for very high symmetry cases, e.g. perfectly isotropic particles in unaberrated, linearly polarized Gaussian traps. We report an experimental observation that when a birefringent microsphere is held in a linearly polarised Gaussian optical trap in vacuum, spontaneous oscillations emerge that grow rapidly in amplitude and become increasingly coherent as the air pressure is reduced. Furthermore, when parametrically driven, these self-sustained oscillators exhibit an ultrahigh mechanical quality factor > 2 x 10⁸, which can be highly sensitive to external purtabations.

Original language	English
Title of host publication	Optical Manipulation and Structured Materials Conference 2020
Editors	Takashige Omatsu, Kishan Dholakia, Hajime Ishihara, Keiji Sasaki
Publisher	SPIE
ISBN (Electronic)	9781510638518
DOIs	https://doi.org/10.1117/12.2573530
Publication status	Published - 2020
Event	Optical Manipulation and Structured Materials Conference 2020 - Yokohama, Japan Duration: 2020 Apr 20 → 2020 Apr 24

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	11522
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Optical Manipulation and Structured Materials Conference 2020
Country/Territory	Japan
City	Yokohama
Period	20/4/20 → 20/4/24

Bibliographical note

Funding Information:
We acknowledge the support from Engineering and Physical Sciences Research Council (EP/030017/1) and Czech Science Agency (GA19-17765S).

Publisher Copyright:
© 2020 SPIE.

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Computer Science Applications
Applied Mathematics
Electrical and Electronic Engineering

Access to Document

10.1117/12.2573530

Cite this

Arita, Y., Simpson, S. H., Zemánek, P., & Dholakia, K. (2020). Coherent oscillations of a birefringent microsphere in vacuum optical traps. In T. Omatsu, K. Dholakia, H. Ishihara, & K. Sasaki (Eds.), Optical Manipulation and Structured Materials Conference 2020 Article 115221C (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11522). SPIE. https://doi.org/10.1117/12.2573530

Arita, Yoshihiko ; Simpson, Stephen H. ; Zemánek, Pavel et al. / Coherent oscillations of a birefringent microsphere in vacuum optical traps. Optical Manipulation and Structured Materials Conference 2020. editor / Takashige Omatsu ; Kishan Dholakia ; Hajime Ishihara ; Keiji Sasaki. SPIE, 2020. (Proceedings of SPIE - The International Society for Optical Engineering).

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title = "Coherent oscillations of a birefringent microsphere in vacuum optical traps",

abstract = "When particles are held in optical tweezers, we assume that they are in thermal equilibrium, in which the equipartition of energy determines the position variance of optically trapped spheres. Here we show that this condition only holds for very high symmetry cases, e.g. perfectly isotropic particles in unaberrated, linearly polarized Gaussian traps. We report an experimental observation that when a birefringent microsphere is held in a linearly polarised Gaussian optical trap in vacuum, spontaneous oscillations emerge that grow rapidly in amplitude and become increasingly coherent as the air pressure is reduced. Furthermore, when parametrically driven, these self-sustained oscillators exhibit an ultrahigh mechanical quality factor > 2 x 108, which can be highly sensitive to external purtabations.",

author = "Yoshihiko Arita and Simpson, {Stephen H.} and Pavel Zem{\'a}nek and Kishan Dholakia",

note = "Funding Information: We acknowledge the support from Engineering and Physical Sciences Research Council (EP/030017/1) and Czech Science Agency (GA19-17765S). Publisher Copyright: {\textcopyright} 2020 SPIE.; Optical Manipulation and Structured Materials Conference 2020 ; Conference date: 20-04-2020 Through 24-04-2020",

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doi = "10.1117/12.2573530",

language = "English",

series = "Proceedings of SPIE - The International Society for Optical Engineering",

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Arita, Y, Simpson, SH, Zemánek, P & Dholakia, K 2020, Coherent oscillations of a birefringent microsphere in vacuum optical traps. in T Omatsu, K Dholakia, H Ishihara & K Sasaki (eds), Optical Manipulation and Structured Materials Conference 2020., 115221C, Proceedings of SPIE - The International Society for Optical Engineering, vol. 11522, SPIE, Optical Manipulation and Structured Materials Conference 2020, Yokohama, Japan, 20/4/20. https://doi.org/10.1117/12.2573530

Coherent oscillations of a birefringent microsphere in vacuum optical traps. / Arita, Yoshihiko; Simpson, Stephen H.; Zemánek, Pavel et al.
Optical Manipulation and Structured Materials Conference 2020. ed. / Takashige Omatsu; Kishan Dholakia; Hajime Ishihara; Keiji Sasaki. SPIE, 2020. 115221C (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11522).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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T1 - Coherent oscillations of a birefringent microsphere in vacuum optical traps

AU - Arita, Yoshihiko

AU - Simpson, Stephen H.

AU - Zemánek, Pavel

AU - Dholakia, Kishan

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AB - When particles are held in optical tweezers, we assume that they are in thermal equilibrium, in which the equipartition of energy determines the position variance of optically trapped spheres. Here we show that this condition only holds for very high symmetry cases, e.g. perfectly isotropic particles in unaberrated, linearly polarized Gaussian traps. We report an experimental observation that when a birefringent microsphere is held in a linearly polarised Gaussian optical trap in vacuum, spontaneous oscillations emerge that grow rapidly in amplitude and become increasingly coherent as the air pressure is reduced. Furthermore, when parametrically driven, these self-sustained oscillators exhibit an ultrahigh mechanical quality factor > 2 x 108, which can be highly sensitive to external purtabations.

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Coherent oscillations of a birefringent microsphere in vacuum optical traps

Abstract

Publication series

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Bibliographical note

All Science Journal Classification (ASJC) codes

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