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Birefringence-induced phase delay enables Brillouin mechanical imaging in turbid media.
Nat Commun
June 2024
CNR-Istituto di Fotonica e Nanotecnologie, CNR-IFN, Piazza Leonardo da Vinci 32, 20133, Milano, Italy.
Article Synopsis
- Acoustic vibrations provide key viscoelastic information that can be analyzed using inelastic Brillouin scattered light, but traditional methods struggle with turbid samples due to excess background light.
- The introduction of a common-path Birefringence-Induced Phase Delay (BIPD) filter allows for better separation of Brillouin and Rayleigh signals, significantly reducing background noise by an extinction ratio of 65 dB.
- This technique was successfully applied to image bone tissues in a mouse model of osteopetrosis, revealing changes in biomechanical properties and offering new insights into mechanobiology for challenging biological samples.
Optical Effect Modulation in Polarized Raman Spectroscopy of Transparent Layered α-MoO.
Small
May 2023
School of Science and Ministry of Industry and Information Technology Key Laboratory of Micro-Nano Optoelectronic Information System, Harbin Institute of Technology Shenzhen, Shenzhen, Guangdong, 518055, P. R. China.
Optical anisotropy, which is quantified by birefringence (Δn) and linear dichroism (Δk), can significantly modulate the angle-resolved polarized Raman spectroscopy (ARPRS) response of anisotropic layered materials (ALMs) by external interference. This work studies the separate modulation of birefringence on the ARPRS response and the intrinsic response by selecting transparent birefringent crystal α-MoO as an excellent platform. It is found that there are several anomalous ARPRS responses in α-MoO that cannot be reproduced by the real Raman tensor widely used in non-absorbing materials; however, they can be well explained by considering the birefringence-induced Raman selection rules.
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