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Refractive index enhancement and ato...

Proite, Nicholas A.

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Refractive index enhancement and atomic state localization in rubidium.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Refractive index enhancement and atomic state localization in rubidium./
作者:	Proite, Nicholas A.
出版者:	Ann Arbor : ProQuest Dissertations & Theses, : 2011,
面頁冊數:	111 p.
附註:	Source: Dissertation Abstracts International, Volume: 72-10, Section: B, page: 6049.
Contained By:	Dissertation Abstracts International72-10B.
標題:	Atomic physics. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3471169
ISBN:	9781124822723

Refractive index enhancement and atomic state localization in rubidium.
Proite, Nicholas A.

Refractive index enhancement and atomic state localization in rubidium. - Ann Arbor : ProQuest Dissertations & Theses, 2011 - 111 p.

Source: Dissertation Abstracts International, Volume: 72-10, Section: B, page: 6049.

Thesis (Ph.D.)--The University of Wisconsin - Madison, 2011.

It is well known that the resolution of a traditional optical imaging system is limited by the wavelength of light. This is the co-called diffraction limit and overcoming this barrier has been the subject of intense theoretical and experimental research. At its basis, the diffraction limit stipulates that light cannot be focused to a waist narrower than half its wavelength. In this thesis, we explore two approaches to overcoming this barrier in the context of resolving an object. First, we describe a scheme which enhances the index of refraction of a medium to a very large value. This effectively reduces the wavelength of a laser beam inside the medium. The essential idea is to excite two Raman resonances with appropriately chosen strong control lasers. We experimentally demonstrate this idea with a set of lasers propagating through a hot vapor cell of rubidium. Additionally, we report an experimental demonstration of Raman self-focusing and self-defocusing in a far-off resonant scheme. The key idea is to drive the hyperfine transition rubidium to a maximally coherent state with two laser beams. In this regime, the two-photon detuning from the Raman resonance controls the nonlinear index of the medium. We find good agreement between numerical simulations and experimental results. Next, we outline and demonstrate the basic concepts of a type of scanning fluorescence microscope that is capable of resolving nanometer-size objects in the far field. The key idea is to use a spatially varying laser beam to set up an atomic dark state with sensitive position dependence. This localizes the atomic excitation of a gas to a spot much smaller than a diffraction limited optical waist. We experimentally demonstrate the first steps towards subwavelength resolution in an ultracold cloud of rubidium.

ISBN: 9781124822723Subjects--Topical Terms:

3173870
Atomic physics.

Refractive index enhancement and atomic state localization in rubidium.
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