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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 19 — Sep. 18, 2006
  • pp: 8622–8629

Interferometric tunability of absorption

Vittorio Giovannetti, Seth Lloyd, and Lorenzo Maccone  »View Author Affiliations

Optics Express, Vol. 14, Issue 19, pp. 8622-8629 (2006)

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We propose an interferometric setup that permits to tune the quantity of radiation absorbed by an object illuminated by a fixed light source. The method can be used to selectively irradiate portions of an object based on their transmissivities or to accurately estimate the transmissivities from rough absorption measurements.

© 2006 Optical Society of America

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(170.0110) Medical optics and biotechnology : Imaging systems
(300.1030) Spectroscopy : Absorption

ToC Category:
Instrumentation, Measurement, and Metrology

Original Manuscript: May 15, 2006
Manuscript Accepted: June 17, 2006
Published: September 18, 2006

Vittorio Giovannetti, Seth Lloyd, and Lorenzo Maccone, "Interferometric tunability of absorption," Opt. Express 14, 8622-8629 (2006)

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  8. Rigorously speaking, the transformation βn+1 ->√ηβn+1 does not correspond to the linear mapping |βn+1i - > |√ηβ n+1i but to its density matrix counterpart: |βn+1ihβn+1| ->|√ηβn+1ih√ηβn+1|. The latter accounts for decoherence effect, whereas the former does not. Since in our analysis we are always dealing with factorized states, the two transformations coincide for us.
  9. <other> This effect can be explained intuitively as follows. If the object is transparent, at the first round trip a small amount of radiation leaks into the R modes, at the second round trip a higher amount leaks there and so on constantly increasing through constructive interference until all the radiation moves into such modes after N =π/φ round trips. If, instead, the object is opaque, the little radiation that has leaked into the R modes at the first round trip is absorbed and does not contribute to the constructive interference that would draw more radiation into these modes at the second round trip. As a result very little radiation transfers and most of it remains in the L modes.</other>

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