OSA's Digital Library

Optics Letters

Optics Letters


  • Vol. 26, Iss. 4 — Feb. 15, 2001
  • pp: 235–237

Measurement of the anomalous phase velocity of ballistic light in a random medium by use of a novel interferometer

Changhuei Yang, Adam Wax, and Michael S. Feld  »View Author Affiliations

Optics Letters, Vol. 26, Issue 4, pp. 235-237 (2001)

View Full Text Article

Acrobat PDF (118 KB)

Browse Journals / Lookup Meetings

Browse by Journal and Year


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools



Ballistic light, i.e., radiation that propagates undeflected through a turbid medium, undergoes a small change in phase velocity and exhibits unusual dispersion because of its wave nature. We use a novel highly sensitive differential phase optical interferometer to study these previously unmeasurable phenomena. We find that ballistic propagation can be classified into three regimes based on the wavelength-to-size ratio. In the regime in which the scatterer size is comparable with the wavelength, there is an anomalous phase-velocity increase as a result of adding scatterers of higher refractive index. We also observe an anomaly in the relative phase velocity, where red light is slowed more than blue light even though the added scatterers are made of material with normal dispersion.

© 2001 Optical Society of America

OCIS Codes
(000.2690) General : General physics
(030.1640) Coherence and statistical optics : Coherence
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.5050) Instrumentation, measurement, and metrology : Phase measurement

Changhuei Yang, Adam Wax, and Michael S. Feld, "Measurement of the anomalous phase velocity of ballistic light in a random medium by use of a novel interferometer," Opt. Lett. 26, 235-237 (2001)

Sort:  Author  |  Year  |  Journal  |  Reset


  1. K. M. Yoo and R. R. Alfano, Opt. Lett. 15, 320 (1990).
  2. D. A. Benaron and D. K. Stevenson, Science 259, 1463 (1993).
  3. C. Yang, K. An, L. T. Perelman, R. R. Dasari, and M. S. Feld, J. Opt. Soc. Am. A 16, 866 (1999).
  4. W. Drexler, U. Morgner, F. X. Kartner, C. Pitris, S. A. Boppart, X. D. Li, E. P. Ippen, and J. G. Fujimoto, Opt. Lett. 24, 1221 (1999).
  5. S. Chandrasekhar, Radiative Transfer (Dover, New York, 1960).
  6. H. C. van de Hulst, Light Scattering by Small Particles (Dover, New York, 1957).
  7. C. Yang, A. Wax, I. Georgakoudi, E. B. Hanlon, K. Badizadegan, R. R. Dasari, and M. S. Feld, Opt. Lett. 25, 1526 (2000).
  8. Y. Zhao, Z. Chen, C. Saxer, S. Xiang, J. F. de Boer, and J. S. Nelson, Opt. Lett. 25, 114 (2000).
  9. L. Mandel and E. Wolf, Optical Coherence and Quantum Optics (Cambridge U. Press, Cambridge, 1995).
  10. H. Matsumoto, Rev. Sci. Instrum. 65, 2894 (1994).
  11. H. Matsumoto and L. Zeng, Opt. Commun. 104, 241 (1994).
  12. J. Irby, R. Murray, P. Acedo, and H. Lamela, Rev. Sci. Instrum. 70, 699 (1999).
  13. L. T. Perelman, V. Backman, M. Wallace, G. Zonios, R. Manohanan, A. Nusrat, S. Shields, M. Seiler, C. Lima, T. Hamamo, I. Itzkan, J. Van Dam, J. M. Crawford, and M. S. Feld, Phys. Rev. Lett. 80, 627 (1998).

Cited By

Alert me when this paper is cited

OSA is able to provide readers links to articles that cite this paper by participating in CrossRef's Cited-By Linking service. CrossRef includes content from more than 3000 publishers and societies. In addition to listing OSA journal articles that cite this paper, citing articles from other participating publishers will also be listed.

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited