Non-conservative instabilities in optical vacuum traps
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68081731%3A_____%2F20%3A00532398" target="_blank" >RIV/68081731:_____/20:00532398 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1117/12.2545948" target="_blank" >http://dx.doi.org/10.1117/12.2545948</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1117/12.2545948" target="_blank" >10.1117/12.2545948</a>
Alternative languages
Result language
angličtina
Original language name
Non-conservative instabilities in optical vacuum traps
Original language description
Particles held in optical tweezers are commonly thought to be at thermodynamic equilibrium with their environment. Under this assumption the elastic energy of the trap is equal to the thermal energy. As a result the variance of the particle position is completely independent of viscosity and inversely proportional to the optical power in the trap. Here we show that these conditions only hold for very high symmetry cases e.g. perfectly spherical particles in unaberrated, linearly polarized Gaussian traps. Here we show that any reduction in symmetry leads to asymmetrically coupled degrees of freedom. The associated force field is linearly non-conservative and the tweezer is no longer at equilibrium. In overdamped systems the effect is a underlying systematic bias to the Brownian motion. In underdamped systems, this systematic component can accumulate momentum, eventually destabilizing the trap. We illustrate this latter effect with reference to two systems, (i) an isotropic sphere in a circularly polarized trap, and (ii) a birefringent sphere in a linearly polarized trap. In both cases the instability can be approached either by decreasing air pressure or by increasing optical power. Close to instability, the trapped particle executes increasingly coherent motion that is highly sensitive to external perturbations. Potential applications to weak force sensing are discussed.
Czech name
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Czech description
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Classification
Type
D - Article in proceedings
CEP classification
—
OECD FORD branch
10306 - Optics (including laser optics and quantum optics)
Result continuities
Project
<a href="/en/project/GA19-17765S" target="_blank" >GA19-17765S: Multidimensional nonlinear optomechanics of levitated nanosystems</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Article name in the collection
Complex Light and Optical Forces XIV. Proceedings of SPIE
ISBN
978-1-5106-3358-2
ISSN
0277-786X
e-ISSN
1996-756X
Number of pages
6
Pages from-to
112970F
Publisher name
SPIE
Place of publication
Bellingham
Event location
San Francisco
Event date
Feb 4, 2020
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
000552296600008