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Exploring novel methods of interfero...

Hwang, Jaesuk.

Exploring novel methods of interferometric detection of ultrasmall phaseshifts.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Exploring novel methods of interferometric detection of ultrasmall phaseshifts.
Author:	Hwang, Jaesuk.
Description:	159 p.
Notes:	Adviser: W. E. Moerner.
Notes:	Source: Dissertation Abstracts International, Volume: 67-09, Section: B, page: 5159.
Contained By:	Dissertation Abstracts International67-09B.
Subject:	Chemistry, Physical.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3235236
ISBN:	9780542894350

Exploring novel methods of interferometric detection of ultrasmall phaseshifts.
Hwang, Jaesuk.

Exploring novel methods of interferometric detection of ultrasmall phaseshifts. - 159 p.

Adviser: W. E. Moerner.

Thesis (Ph.D.)--Stanford University, 2006.

A scanning optical microscope based on polarization Sagnac interferometry for measuring ultrasmall phase shifts is described. This device is designed to detect small numbers of absorbing molecules in a solid without the use of fluorescence. The absorption and concomitant optical phase shift of terrylene dopant molecules in a p-terphenyl host crystal are made time dependent by periodic optical saturation of the sample. A detection sensitivity of 8.75 x 10-8 rad is achieved with a 0.078 Hz bandwidth, and detection of signals from as few as 19+/-3 terrylene molecules is demonstrated at room temperature.

ISBN: 9780542894350Subjects--Topical Terms:

226924
Chemistry, Physical.

Exploring novel methods of interferometric detection of ultrasmall phaseshifts.
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100 0 $a Hwang, Jaesuk. $3 264251
245 1 0 $a Exploring novel methods of interferometric detection of ultrasmall phaseshifts.
300 $a 159 p.
500 $a Adviser: W. E. Moerner.
500 $a Source: Dissertation Abstracts International, Volume: 67-09, Section: B, page: 5159.
502 $a Thesis (Ph.D.)--Stanford University, 2006.
520 # $a A scanning optical microscope based on polarization Sagnac interferometry for measuring ultrasmall phase shifts is described. This device is designed to detect small numbers of absorbing molecules in a solid without the use of fluorescence. The absorption and concomitant optical phase shift of terrylene dopant molecules in a p-terphenyl host crystal are made time dependent by periodic optical saturation of the sample. A detection sensitivity of 8.75 x 10-8 rad is achieved with a 0.078 Hz bandwidth, and detection of signals from as few as 19+/-3 terrylene molecules is demonstrated at room temperature.
520 # $a A theoretical study is presented of various optical configurations designed to detect a single nanoparticle with a laser beam. These schemes take advantage of interference between the forward scattered light from a nanoparticle and the incident light to facilitate a linear dependence of the signal on the nanoparticle volume. With the help of the Gouy phase concept, the far-field signal-to-noise ratio induced by a nanoparticle in a focused Gaussian beam is presented as a function of exact nanoparticle position with respect to the beam waist.
520 # $a As an attempt to increase the signal from a single nanoscale object in the presence of shot noise, photothermal spectroscopy is investigated. In photothermal detection, the change in refractive index of the sample matrix induced by the heat deposited by laser excitation is detected. Local accumulation of heat leads to enhanced scattering of the probing laser beam. After the principles of photothermal spectroscopy are reviewed, preliminary experiments are described to demonstrate photothermal detection of small numbers of single-wall carbon nanotubes in a polymer matrix. This geometry may lead to an in-cell imaging application, and would prove useful in studies of photothermal cancer therapy.
520 # $a In this thesis, several novel direct optical detection schemes are presented which allow ultrasensitive absorption measurements of organic molecules and nanoparticles at room temperature.
590 $a School code: 0212.
650 # 0 $a Chemistry, Physical. $3 226924
650 # 0 $a Physics, Molecular. $3 227726
650 # 0 $a Physics, Optics. $3 226935
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710 0 # $a Stanford University. $3 212607
773 0 # $g 67-09B. $t Dissertation Abstracts International
790 $a 0212
790 1 0 $a Moerner, W. E., $e advisor
791 $a Ph.D.
792 $a 2006
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