2004
DOI: 10.1364/ol.29.001906
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Coherent backscattering spectroscopy

Abstract: Coherent backscattering (CBS) of light in random media has been previously investigated by use of coherent light sources. Here we report a novel method of CBS measurement that combines low spatial coherence, broadband illumination, and spectrally resolved detection. We show that low spatial coherence illumination leads to an anomalously broad CBS peak and a dramatic speckle reduction; the latter is further facilitated by low temporal coherence detection. Thus CBS can be observed in biological tissue and other … Show more

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Cited by 73 publications
(94 citation statements)
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“…15,16 This reflectance method is not hindered by the measurement geometry limitations that are present in the integrating sphere technique and does not require any manipulation of the sample. LEBS is capable of measuring the reflectance distribution at small scattering distances (i.e., separations between incident and collected ray pairs well below the transport mean free path length or even the mean free path length) resulting in a high sensitivity to the phase function.…”
Section: Introductionmentioning
confidence: 99%
“…15,16 This reflectance method is not hindered by the measurement geometry limitations that are present in the integrating sphere technique and does not require any manipulation of the sample. LEBS is capable of measuring the reflectance distribution at small scattering distances (i.e., separations between incident and collected ray pairs well below the transport mean free path length or even the mean free path length) resulting in a high sensitivity to the phase function.…”
Section: Introductionmentioning
confidence: 99%
“…Enhanced backscattering using a broadband, low spatial-coherence source has recently been employed for depth-resolved profiling of biological tissue [5]. With low-spatial coherence light, optical paths with a transverse distance at the surface larger than the spatial coherence length do not contribute to enhanced backscattering.…”
Section: Introductionmentioning
confidence: 99%
“…Furthermore, our finding that the local scattering power increased with age in the control mice is also in agreement with the studies in cervical cancer. 33 The previous animal studies 12,14,15 of precancerous alterations in colon cancer focused on the utility of the spectral properties of LEBS. On the other hand, our current study reports that a different quantification of LEBS ͑i.e., the enhancement factor͒ has the potential as an easily measurable robust biomarker, not dependent on the illumination intensity.…”
Section: Results and Discussion Of The Pilot Animal Studymentioning
confidence: 99%
“…Any changes in the LEBS enhancement factor are directly related to changes in p͑r Ͻ L sc ͒. In our previous studies, [11][12][13][14][15][16] low-spatial-coherence illumination was implemented in EBS to isolate low-order scattering by dephasing the conjugated time-reversed paths outside its spatially coherent area when L sc Ӷ l s * . In this case, the coherent area ͑or the transverse modes͒ can be as small as L sc 2 =50 2 to 100 2 m 2 , while l s * is of the order of a few millimeters in biological tissue.…”
Section: Introductionmentioning
confidence: 99%