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Design and Characterization of an Apparatus for Short Range Force Detection at Sub-Micron Distances With Optically Trapped Nanoparticles.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Design and Characterization of an Apparatus for Short Range Force Detection at Sub-Micron Distances With Optically Trapped Nanoparticles./
Author:	Galla, Chethn Krishna.
Description:	1 online resource (168 pages)
Notes:	Source: Dissertations Abstracts International, Volume: 85-06, Section: B.
Contained By:	Dissertations Abstracts International85-06B.
Subject:	Optics. -
Online resource:	click for full text (PQDT)
ISBN:	9798381175073

Design and Characterization of an Apparatus for Short Range Force Detection at Sub-Micron Distances With Optically Trapped Nanoparticles.
Galla, Chethn Krishna.

Design and Characterization of an Apparatus for Short Range Force Detection at Sub-Micron Distances With Optically Trapped Nanoparticles. - 1 online resource (168 pages)

Source: Dissertations Abstracts International, Volume: 85-06, Section: B.

Thesis (Ph.D.)--Northwestern University, 2023.

Includes bibliographical references

Optically levitated dielectric nanoparticles have shown great promise as sensors of feeble forces due to their excellent decoupling from the environment at high vacuum and could potentially attain a high mechanical quality factor of order of 1012. Optically levitated nanoparticles are can be used for investigating fundamental physics like the casimir effect, high-frequency gravitational waves and to search for gravitational like forces at sub-millimeter range.Gravity is the weakest of the four fundamental forces in the standard model. This is the Hierarchy Problem, which necessitates an extreme fine tuning in the Standard model in order to explain the mass of the Higgs boson. Some theorized that gravity is visibly weak only because it travels through multiple dimensions which are present at sub-millimeter range. Other theoretical solutions to the hierarch problem such as supersymmetry or string theory also predict that Newtonian gravity will be modified at sub-mm length scales.In this dissertation we present the design and characterization of an apparatus for investigating Non-Newtonian Forces at micron length scales. We have designed and characterized a fiber based dual beam dipole trap with in-situ 3D scanning force sensing capability. We have also successfully designed and characterized a retro-reflective trap to position particles within micron distances of a surface. We have studied the mechanical properties of dielectric nanospheres and ways to improve the trap stability of these nano-particles at high vacuum and also designed an apparatus for in-vacuum loading of the said nano-particles into optical traps. Various techniques for calibration of distances have been presented. Preliminary Force Measurements were performed and Force sensitivity of the order of zN has been reported, indicating promise for future improved tests of gravity at micron distances.Techniques for fabrication of high aspect ratio silica discs and stacks have been presented which can be used in further improving the search for non-newtonian gravity and high frequency gravitational waves.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798381175073Subjects--Topical Terms:

595336
Optics.
Subjects--Index Terms:

NanoparticleIndex Terms--Genre/Form:

554714
Electronic books.

Design and Characterization of an Apparatus for Short Range Force Detection at Sub-Micron Distances With Optically Trapped Nanoparticles.
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520 $a Optically levitated dielectric nanoparticles have shown great promise as sensors of feeble forces due to their excellent decoupling from the environment at high vacuum and could potentially attain a high mechanical quality factor of order of 1012. Optically levitated nanoparticles are can be used for investigating fundamental physics like the casimir effect, high-frequency gravitational waves and to search for gravitational like forces at sub-millimeter range.Gravity is the weakest of the four fundamental forces in the standard model. This is the Hierarchy Problem, which necessitates an extreme fine tuning in the Standard model in order to explain the mass of the Higgs boson. Some theorized that gravity is visibly weak only because it travels through multiple dimensions which are present at sub-millimeter range. Other theoretical solutions to the hierarch problem such as supersymmetry or string theory also predict that Newtonian gravity will be modified at sub-mm length scales.In this dissertation we present the design and characterization of an apparatus for investigating Non-Newtonian Forces at micron length scales. We have designed and characterized a fiber based dual beam dipole trap with in-situ 3D scanning force sensing capability. We have also successfully designed and characterized a retro-reflective trap to position particles within micron distances of a surface. We have studied the mechanical properties of dielectric nanospheres and ways to improve the trap stability of these nano-particles at high vacuum and also designed an apparatus for in-vacuum loading of the said nano-particles into optical traps. Various techniques for calibration of distances have been presented. Preliminary Force Measurements were performed and Force sensitivity of the order of zN has been reported, indicating promise for future improved tests of gravity at micron distances.Techniques for fabrication of high aspect ratio silica discs and stacks have been presented which can be used in further improving the search for non-newtonian gravity and high frequency gravitational waves.
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