Article,
Measurement of diffuse photon-pairs density wave in a multiple-scattering medium
(2008)
Abstract
As a continuation of the previously developed theory of a diffuse
photon-pairs density wave (DPPDW) Appl. Opt. 44, 1416-1425 (2005),
this research experimentally studies and verifies the DPPDW theory
in a heterogeneous multiple-scattering medium. The DPPDW is generated
by collecting the scattered linear polarized photon pairs (LPPPs)
in the multiple-scattering medium. Theoretically, the common-path
propagation of LPPPs not only provides common phase noise rejection
mode but also performs coherence technique via heterodyne detection.
In addition, the polarization gating and spatial coherence gating
of LPPPs would suppress the severe scattered photon in the multiple-scattering
medium. In the experiment, the amplitude and phase wavefronts of
DPPDWs, which are distorted by a small object embedded in a homogeneous
multiple-scattering medium, are measured in one dimension or two
dimensions by scanning the source detector pair. The measured distortion
of DPPDW wavefronts are detected precisely and are consistent with
the theoretical. calculation of DPPDW. It implies an improvement
on the detection sensitivity of a small object compared with the
conventional diffuse photon density wave (DPDW). (c) 2008 Optical
Society of America.
