AI Article Synopsis
- - The creation of a sub-diffraction longitudinally polarized spot is crucial for advanced technologies like optical tweezers and super-resolution microscopy, focusing light beyond traditional limits.
- - A new experimental approach using a binary phase lens has been developed, which effectively focuses radially polarized light to achieve a focal spot size smaller than the diffraction limit.
- - The lens operates with a high numerical aperture of 0.93 and generates a focal spot with a size approximately 0.456 times the wavelength, along with a sub-diffraction optical needle.
Article Abstract
The generation of a sub-diffraction longitudinally polarized spot is of great interest in various applications, such as optical tweezers, super-resolution microscopy, high-resolution Raman spectroscopy, and high-density optical data storage. Many theoretical investigations have been conducted into the tight focusing of a longitudinally polarized spot with high-numerical-aperture aplanatic lenses in combination with optical filters. Optical super-oscillation provides a new approach to focusing light beyond the diffraction limit. Here, we propose a planar binary phase lens and experimentally demonstrate the generation of a longitudinally polarized sub-diffraction focal spot by focusing radially polarized light. The lens has a numerical aperture of 0.93 and a long focal length of 200λ for wavelength λ = 632.8 nm, and the generated focal spot has a full-width-at-half-maximum of about 0.456λ, which is smaller than the diffraction limit, 0.54λ. A 5λ-long longitudinally polarized optical needle with sub-diffraction size is also observed near the designed focal point.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5150649 | PMC |
| http://dx.doi.org/10.1038/srep38859 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Effect of electrochemical topology on detection sensitivity in MEA assay for drug-induced cardiotoxicity screening.
Biosens Bioelectron
December 2024
Department of Biomedical Engineering, Johns Hopkins University, Baltimore, MD, 21205, United States; Department of Medicine, Johns Hopkins University, Baltimore, MD, 21205, United States; Institute for NanoBio Technology, Johns Hopkins University, Baltimore, MD, 21218, United States; Center for Microphysiological Systems, Johns Hopkins University, Baltimore, MD, 21205, United States. Electronic address:
Cardiotoxicity remains a major challenge in drug development, accounting for 45% of medication withdrawals due to cardiac ischemia and arrhythmogenicity. To overcome the limitations of traditional multielectrode array (MEA)-based cardiotoxicity assays, we developed a Nafion-coated NanoMEA platform with decoupled reference electrodes, offering enhanced sensitivity for electrophysiological measurements. The 'Decoupled' configuration significantly reduced polarization resistance (Rp) from 12.
View Article and Find Full Text PDFPolarised crowd in motion: insights into statistical and dynamical behavior.
Sci Rep
December 2024
Department of Physics, IIT(BHU), Varanasi, 221005, U.P., India.
The collection of active agents often exhibits intriguing statistical and dynamical properties, particularly when considering human crowds. In this study, we have developed a computational model to simulate the recent experiment on real marathon races by Bain et al. (Science 363:46-49, 2019).
View Article and Find Full Text PDFSpectroscopic amplifier for ultrahigh plasmonic-based enhancement of the hyper-Raman scattering procedure.
Nanotechnology
January 2025
Department of Physics, College of Science, King Faisal University, Al-Ahsa, Saudi Arabia.
An anisotropic plasmonic trimer is proposed as an effective spectroscopic amplifier for the maximum signal enhancement of the hyper-Raman Scattering (HRS) process. The three-particle system is composed of asymmetric Au nanorings arranged collinearly in a J-aggregate configuration and illuminated by a longitudinally polarized light. The optical properties of the considered trimer have been numerically simulated by the finite-difference time-domain method.
View Article and Find Full Text PDFTaking into account phase-polarization interactions is crucial for the formation of spatially structured laser beams. The effects that arise in this context can lead to the modulation of individual field components and the transformation of the overall light field. In this study, we investigate the impact of phase and polarization distributions with radial dependencies in polar coordinates on the longitudinal component of laser beams passing through a transmissive spatial light modulator (SLM) based on twisted nematic liquid crystals.
View Article and Find Full Text PDFShort-time collective dynamics of an ionic liquid: A computer simulation study with non-polarizable and polarizable models, and ab initio molecular dynamics.
J Chem Phys
December 2024
Laboratório de Espectroscopia Molecular, Departamento de Química Fundamental, Instituto de Química, Universidade de São Paulo, 05513-970 São Paulo, SP, Brazil.
Molecular dynamics (MD) simulation is used to study the intermolecular dynamics in the THz frequency range of the ionic liquid 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide, [C2C1im][FSI]. Non-polarizable and polarizable models for classical MD simulation are compared using as quality criteria ab initio molecular dynamics (AIMD) and experimental data from far-infrared (FIR) spectroscopy and previously published data of inelastic x-ray scattering (IXS). According to data from IXS spectroscopy, incorporating polarization in the classical MD simulation has relatively little effect on the dispersion curve (excitation frequency vs wavevector) for longitudinal acoustic modes.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!