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Standing Waves in a Cavity01:28

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Accurately determining beam deflection and slope under various loading conditions in structural engineering is crucial for ensuring safety and structural integrity. Singularity functions offer a streamlined approach to analyzing beams, especially when multiple loading functions complicate the bending moment equation.
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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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High-efficiency nonlocal reflection-type vortex beam generation based on bound states in the continuum.

Tongyu Li1, Jiajun Wang1, Wenjie Zhang1

  • 1State Key Laboratory of Surface Physics, Key Laboratory of Micro- and Nano-Photonic Structures (Ministry of Education) and Department of Physics, Fudan University, Shanghai 200433, China.

National Science Review
|April 28, 2023
PubMed
Summary

Researchers developed a high-efficiency method for generating vortex beams using photonic crystal slabs. This novel approach offers flexible, alignment-free vortex beam generation with up to 86% conversion efficiency.

Keywords:
bound states in the continuumphotonic crystal slabvortex beam

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Area of Science:

  • Photonics
  • Optical Metamaterials
  • Beam Generation

Background:

  • Bound states in the continuum (BICs) in periodic structures like photonic crystal slabs enable novel optical phenomena.
  • Momentum-space polarization vortices offer a nonlocal approach for generating vortex beams.
  • Existing nonlocal generators lack sufficient efficiency for practical applications.

Purpose of the Study:

  • To propose a guideline for designing high-efficiency nonlocal reflection-type vortex generators.
  • To optimize the conversion efficiency of vortex beams generated by photonic crystal slabs.
  • To investigate the factors limiting generation efficiency.

Main Methods:

  • Utilizing temporal-coupled-mode theory for generator design.
  • Theoretically designing and experimentally characterizing photonic crystal slabs.
  • Analyzing the ratio of radiative loss to intrinsic absorption.

Main Results:

  • A guideline for high-efficiency nonlocal vortex generator design was established.
  • Photonic crystal slabs were optimized for efficient vortex beam generation.
  • A maximum on-resonance conversion efficiency of up to 86% was achieved.

Conclusions:

  • Reflection-type photonic crystal slabs provide a competitive method for flexible vortex beam generation.
  • The proposed design overcomes efficiency limitations of previous nonlocal generators.
  • The technology combines high efficiency with simple fabrication and no alignment requirements.