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We derive the Goos-Hänchen (GH) and Imbert-Fedorov (IF) shifts of random electromagnetic beams with arbitrary state and degree of polarization and spatial coherence. Further, we demonstrate the general formalism by calculating analytic expressions for the GH and IF shifts of an electromagnetic Gaussian Schell-model (EGSM) beam and show that the GH shifts may exist irrespective of the degree and state of polarization of the beam, while the IF shifts vanish when the beam is either s or p polarized or completely unpolarized. In addition, the spatial coherence width of the EGSM beam is found to influence only the angular GH and IF shifts.
View Article and Find Full Text PDFGlobal alignment and local curvature of microtubules in mouse fibroblasts are robust against perturbations of vimentin and actin.
Soft Matter
January 2025
Institute for X-Ray Physics, University of Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany.
The eukaryotic cytoskeleton is an intricate network of three types of mechanically distinct biopolymers - actin filaments, microtubules and intermediate filaments (IFs). These filamentous networks determine essential cellular functions and properties. Among them, microtubules are important for intracellular transport and establishing cell polarity during migration.
View Article and Find Full Text PDFHighly Efficient and Linearly Polarized Light Emission of Micro-LED Integrated with Double-Functional Meta-Grating.
Nano Lett
January 2025
Key Laboratory for Physical Electronics and Devices of the Ministry of Education & Shaanxi Provincial Key Laboratory of Photonics and Information Technology, Xi'an Jiaotong University, Xi'an 710049, China.
Linearly polarized micro light-emitting diodes (LP-Micro-LEDs) exhibit exceptional potential across diverse fields. The existing methods to introduce polarization to initially unpolarized Micro-LEDs and to further enhance the degree of polarization are, however, at the expense of low luminous efficiency. We fabricated a GaN-based blue Micro-LED integrated with a Al nanograting and a specially designed Ag/GaN meta-grating, which overcomes the dilemma between the luminous efficiency and polarization degree by simultaneously introducing the effects of mode selection and energy recycling.
View Article and Find Full Text PDFUsing Polarization to Increase Contrast of Water OH Raman Scattering Relative to Fluorescence of Dissolved Organic Matter.
Appl Spectrosc
December 2024
Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina, USA.
Environmental fluorescence measurements sometimes use water Raman scattering as an internal standard to compensate for path length, lensing effects, and turbidity. Fluorescent dissolved organic matter (FDOM) in water may interfere strongly with the measurement of this reference. However, fluorescence in fluid solution is largely unpolarized, while the OH stretching Raman band of water is always strongly polarized.
View Article and Find Full Text PDFControlling thermal emission with metasurfaces and its applications.
Nanophotonics
April 2024
National Laboratory of Solid State Microstructures, School of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, Jiangsu 210093, China.
Thermal emission caused by the thermal motion of the charged particles is commonly broadband, un-polarized, and incoherent, like a melting pot of electromagnetic waves, which makes it unsuitable for infrared applications in many cases requiring specific thermal emission properties. Metasurfaces, characterized by two-dimensional subwavelength artificial nanostructures, have been extensively investigated for their flexibility in tuning optical properties, which provide an ideal platform for shaping thermal emission. Recently, remarkable progress was achieved not only in tuning thermal emission in multiple degrees of freedom, such as wavelength, polarization, radiation angle, coherence, and so on but also in applications of compact and integrated optical devices.
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