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Near-Field Optical Forces: Photonics...

Woolf, David Nathaniel.

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Near-Field Optical Forces: Photonics, Plasmonics and the Casimir Effect.

紀錄類型:	書目-語言資料,印刷品 : Monograph/item
正題名/作者:	Near-Field Optical Forces: Photonics, Plasmonics and the Casimir Effect./
作者:	Woolf, David Nathaniel.
面頁冊數:	134 p.
附註:	Source: Dissertation Abstracts International, Volume: 74-10(E), Section: B.
Contained By:	Dissertation Abstracts International74-10B(E).
標題:	Physics, General. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3567124
ISBN:	9781303187629

Near-Field Optical Forces: Photonics, Plasmonics and the Casimir Effect.
Woolf, David Nathaniel.

Near-Field Optical Forces: Photonics, Plasmonics and the Casimir Effect. - 134 p.

Source: Dissertation Abstracts International, Volume: 74-10(E), Section: B.

Thesis (Ph.D.)--Harvard University, 2013.

The coupling of macroscopic objects via the optical near-field can generate strong attractive and repulsive forces. Here, I explore the static and dynamic optomechanical interactions that take place in a geometry consisting of a silicon nanomembrane patterned with a square-lattice photonic crystal suspended above a silicon-on-insulator substrate. This geometry supports a hybridized optical mode formed by the coupling of eigenmodes of the membrane and the silicon substrate layer. This system is capable of generating nanometer-scale deflections at low optical powers for membrane-substrate gaps of less than 200 nm due to the presence of an optical cavity created by the photonic crystal that enhances both the optical force and a force that arises from photo-thermal-mechanical properties of the system. Feedback between Brownian motion of the membrane and the optical and photo-thermal forces lead to dynamic interactions that perturb the mechanical frequency and linewidth in a process known as ``back-action.'' The static and dynamic properties of this system are responsible for optical bistability, mechanical cooling and regenerative oscillations under different initial conditions. Furthermore, solid objects separated by a small distance experience the Casimir force, which results from quantum fluctuations of the electromagnetic field (i.e. virtual photons).The Casimir force supplies a strong nonlinear perturbation to membrane motion when the membrane-substrate separation is less than 150 nm. Taken together, the unique properties of this system makes it an intriguing candidate for transduction, accelerometry, and sensing applications.

ISBN: 9781303187629Subjects--Topical Terms:

1018488
Physics, General.

Near-Field Optical Forces: Photonics, Plasmonics and the Casimir Effect.
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500 $a Adviser: Federico Capasso.
502 $a Thesis (Ph.D.)--Harvard University, 2013.
520 $a The coupling of macroscopic objects via the optical near-field can generate strong attractive and repulsive forces. Here, I explore the static and dynamic optomechanical interactions that take place in a geometry consisting of a silicon nanomembrane patterned with a square-lattice photonic crystal suspended above a silicon-on-insulator substrate. This geometry supports a hybridized optical mode formed by the coupling of eigenmodes of the membrane and the silicon substrate layer. This system is capable of generating nanometer-scale deflections at low optical powers for membrane-substrate gaps of less than 200 nm due to the presence of an optical cavity created by the photonic crystal that enhances both the optical force and a force that arises from photo-thermal-mechanical properties of the system. Feedback between Brownian motion of the membrane and the optical and photo-thermal forces lead to dynamic interactions that perturb the mechanical frequency and linewidth in a process known as ``back-action.'' The static and dynamic properties of this system are responsible for optical bistability, mechanical cooling and regenerative oscillations under different initial conditions. Furthermore, solid objects separated by a small distance experience the Casimir force, which results from quantum fluctuations of the electromagnetic field (i.e. virtual photons).The Casimir force supplies a strong nonlinear perturbation to membrane motion when the membrane-substrate separation is less than 150 nm. Taken together, the unique properties of this system makes it an intriguing candidate for transduction, accelerometry, and sensing applications.
520 $a Second, near field optical forces were explored in two geometries involving surface plasmons. The first looked at the forces generated between two plasmonic waveguides at visible frequencies where flat metallic surfaces support tightly confined interface waves and at mid-infrared frequencies, where surface corrugations allow the propagation of surface waves known as ``spoof'' surface plasmons. The second involves the generation of a repulsive force on a low refractive index particle in a high refractive index fluid above a metal surface. This second geometry opens up a potential new avenue for frictionless waveguiding and the study of chemical and biological binding processes where it is desirable to have surfaces in the proximity of one another but not in contact.
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