98%
921
2 minutes
20
We have estimated the intrinsic complex refractive index spectrum of a CsPbBr nanocrystal. With various dilute solutions of CsPbBr nanocrystals dissolved in toluene, effective refractive indices were measured at two different wavelengths using Michelson interferometry. Given the effective absorption spectrum of the solution, a full spectrum of the effective refractive index was also obtained through the Kramers-Krönig relations. Based on the Maxwell-Garnett model in the effective medium approximation, the real and imaginary spectrum of the complex refractive index was estimated for the CsPbBr nanocrystal, and the dominant inaccuracy was attributed to the size inhomogeneity.
Download full-text PDF |
Source |
---|---|
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11820716 | PMC |
http://dx.doi.org/10.3390/nano15030181 | DOI Listing |
Surv Ophthalmol
September 2025
Paris Cité University, Department of Ophthalmology, Lariboisière University Hospital, APHP, F-75010 Paris, France.
Dome-shaped macula (DSM) is a distinctive anatomical entity characterized by an inward convexity of the macula, initially described in highly myopic eyes within posterior staphyloma, but it is now recognized as occurring across a broader spectrum of refractive conditions, including mild myopia and even emmetropia. Since its initial description in 2008, advances in imaging technologies and longitudinal studies have significantly improved our understanding of DSM. This review analyzed the recent literature, focusing on publications from the last 10 years.
View Article and Find Full Text PDFBiol Reprod
September 2025
Département des sciences animales, Faculté des sciences de l'agriculture et de l'alimentation, Université Laval, Québec, Qc, Canada.
Deep 3D imaging of oocytes shows several difficulties. Their large size, spherical shape causes depth-dependent artefactual shadow in the middle, resulting from refractive index mismatches induced by turbid organelles and lipid droplets. These mismatches lead to optical aberrations, increasing the laser spot size at the confocal pinhole plan and causing significant attenuation of fluorescence intensity making difficult to clearly image fine structures such as the transzonal projections (TZPs) connecting cumulus cells and the oocyte.
View Article and Find Full Text PDFAnal Chem
September 2025
Interdisciplinary Laboratories for Advanced Materials Physics (i-LAMP) & Dipartimento di Matematica e Fisica, Università Cattolica del Sacro Cuore, via della Garzetta 48, 25133 Brescia, Italy.
Optical recognition and identification of nanoplastics such as polystyrene nanobeads (PSbs), a widely used polymer and an actual source of environmental pollution, is a challenging task relying on knowledge of the PSbs' refractive index (RI) and its relation to the PSbs' morphology. This is, however, lacking for PSbs' sizes lower than 1 μm. Here, we bridge this gap by measuring UV-vis spectra of PSbs deposited on a sapphire substrate via spin coating and by connecting the experimental data to the RI, PSbs' morphology, and optical transitions through a new optical model based on the Mie theory.
View Article and Find Full Text PDFACS Appl Nano Mater
August 2025
Department of Physics, School of Science and Technology, Nottingham Trent University, Nottingham NG11 8NS, United Kingdom.
Accurate and noninvasive detection of cancer cells is critical for advancing early stage cancer diagnostics and monitoring tumor progression. While manual enumeration methods, such as hemocytometry, remain in use, they suffer from limited sensitivity and scalability. In this article, we report the first feasibility study demonstrating a graphene oxide (GO)-functionalized long-period fiber grating (LPG) sensor for the label-free detection of MCF-7 human breast cancer cell density via secreted cellular byproducts.
View Article and Find Full Text PDFJ Biomed Opt
September 2025
Guangdong University of Technology, Institute of Advanced Photonics Technology, School of Information Engineering, Guangzhou, China.
Significance: Accurate cell classification is essential in disease diagnosis and drug screening. Three-dimensional (3D) voxel models derived from holographic tomography effectively capture the internal structural features of cells, enhancing classification accuracy. However, their high dimensionality leads to significant increases in data volume, computational complexity, processing time, and hardware costs, which limit their practical applicability.
View Article and Find Full Text PDF