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Proceedings Paper

Exploring novel methods of interferometric detection of ultrasmall phase shifts
Author(s): Jaesuk Hwang; Martin M. Fejer; William E. Moerner
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Paper Abstract

We propose a new method to detect ultrasmall nonreciprocal phase shifts in solids based on the Sagnac interferometer combined with internal optical modulation of the absorption. The Sagnac interferometer with heterodyne balanced detection is expected to enable shot-noise-limited detection of phase shift as a result of its insensitivity to frequency and amplitude fluctuations of the laser. The low-concentration molecular sample is internally modulated by optical saturation with a pulsed laser. This internal modulation makes the molecular absorption time-dependent, and also removes the possibility of amplitude modulation feedthrough. We describe the design of this experiment and present preliminary characterizations of the noise performance.

Paper Details

Date Published: 19 June 2003
PDF: 11 pages
Proc. SPIE 4962, Manipulation and Analysis of Biomolecules, Cells, and Tissues, (19 June 2003); doi: 10.1117/12.478913
Show Author Affiliations
Jaesuk Hwang, Stanford Univ. (United States)
Martin M. Fejer, Stanford Univ. (United States)
William E. Moerner, Stanford Univ. (United States)

Published in SPIE Proceedings Vol. 4962:
Manipulation and Analysis of Biomolecules, Cells, and Tissues
Dan V. Nicolau; Joerg Enderlein; Robert C. Leif; Daniel L. Farkas, Editor(s)

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