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Applied Sciences

Polarization-Sensitive Quantum Optical Coherence Tomography: Birefringence Profiles of Biological Samples

Vitaly Sukharenko, R. Dorsinville

Published Jan 30, 2024• 4 citations
Publisher

Abstract

Polarization-sensitive quantum optical coherence tomography (PS-QOCT) is used to image and characterize birefringence effects in biological samples. Entangled photons are generated via spontaneous parametric down-conversion and split into a reference arm and a sample arm of a Mach Zehnder interferometer. Interferometric patterns between two entangled photons reveal information about tissue birefringence. Biological tissue samples are imaged and characterized, and their quantum interference patterns and birefringence profiles are presented.

DOI
10.3390/app14031168

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Polarization-sensitive quantum optical coherence tomography (PS-QOCT) is used to image and characterize birefringence effects in biological samples. Entangled photons are generated via spontaneous parametric down-conversion and split into a reference arm and a sample arm of a Mach Zehnder interferometer. Interferometric patterns between two entangled photons reveal information about tissue birefringence. Biological tissue samples are imaged and characterized, and their quantum interference patterns and birefringence profiles are presented.
Polarization sensitive quantum optical coherence tomography (PS-QOCT) is used to characterize birefringence, scattering/absorption and path length differences in a flat transparent plastic sample. In this Letter, we present the first, to the best of our knowledge, experimental technique of PS-QOCT imaging and characterization of a birefringent material. Polarization sensitive coincidence rate of the entangled photons measured for each pixel and the 2D cross-sectional images are reconstructed. The technique described in this work has many potential applications in the characterization of micro and nano structures, including biological samples.
A number of nonclassical (quantum) sources of light have come to the fore in recent years [1], but few practical applications have emerged. One such application is quantum optical coherence tomography (QOCT) [2, 3], a fourth-order interferometric optical-sectioning scheme that makes use of frequency-entangled photon pairs generated via spontaneous optical parametric down-conversion (SPDC). A particular merit of QOCT is that it is inherently immune to group-velocity dispersion (GVD) by virtue of the frequency entanglement of the photon pairs [4]-[6]. Conventional optical coherence tomography (OCT) [7], in contrast, is a second-order interferometric scheme that provides high-resolution axial sectioning by employing ultra-broadband light. Unfortunately, however, this leads to GVD, which degrades resolution. Here we present the first experimental QOCT images of a biological sample: an onion-skin tissue coated with gold nanoparticles. Three-dimensional images are displayed in the form of transverse sections at different depths. The results reveal that QOCT is a viable biological imaging technique.
We set forth a polarization-sensitive quantum-optical coherence tomography (PS-QOCT) technique that provides axial optical sectioning with polarization-sensitive capabilities. The technique provides a means for determining information about the optical path length between isotropic reflecting surfaces, the relative magnitude of the reflectance from each interface, the birefringence of the interstitial material, and the orientation of the optical axis of the sample. PS-QOCT is immune to sample dispersion and therefore permits measurements to be made at depths greater than those accessible via ordinary optical coherence tomography. We also provide a general Jones matrix theory for analyzing PS-QOCT systems and outline an experimental procedure for carrying out such measurements.
Developing advanced technologies for sensing and imaging biological samples is crucial for medical applications, making quantum-enhanced methods particularly valuable, as they promise significant benefits over classical techniques. An important aspect of biological imaging is the characterization of tissue, which often involves resolving complex structural information such as birefringence and diattenuation. These measures require polarization-sensitive sensing which remains largely unaddressed in quantum-imaging techniques with undetected light. However, the bicolor nature and supreme phase sensitivity of nonlinear interferometers make them particularly advantageous for biological sensing. Hence, we theoretically introduce controllable polarizations of the interrogating light in a quantum-imaging setup and show the potential of nonlinear interferometers to simultaneously sense birefringence and diattenuation with undetected light while discussing both the low- and high-gain regime.