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Related Concept Videos

Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.

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High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
10:40

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Published on: June 28, 2016

High resolution on-chip spectroscopy based on miniaturized microdonut resonators.

Zhixuan Xia1, Ali Asghar Eftekhar, Mohammad Soltani

  • 1School of Electrical and Computer Engineering, Georgia Institute of Technology, 777 Atlantic Drive NW, Atlanta, Georgia 30332, USA.

Optics Express
|July 1, 2011
PubMed
Summary

This study presents a high-resolution integrated spectrometer on a silicon on insulator (SOI) substrate. The device utilizes microdonut resonators for compact, high-performance spectral analysis.

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Last Updated: May 31, 2026

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Published on: April 26, 2014

Area of Science:

  • Photonics and Spectroscopic Technologies
  • Integrated Optics
  • Materials Science

Background:

  • Integrated spectrometers are crucial for various applications, but often face trade-offs between resolution, bandwidth, and size.
  • Silicon photonics offers a promising platform for miniaturizing complex optical systems.

Purpose of the Study:

  • To demonstrate a high-resolution integrated spectrometer with a compact footprint.
  • To leverage microdonut resonators for enhanced spectroscopic performance on a silicon on insulator (SOI) substrate.

Main Methods:

  • Fabrication of a large-scale array of miniaturized microdonut resonators (radius ~2 μm) on an SOI substrate.
  • Utilizing top-view imaging and processing to measure the spectral response.
  • Characterizing the spectrometer's linewidth, operating bandwidth, quality factor, and free spectral range.

Main Results:

  • Achieved a spectral linewidth of approximately 0.6 nm.
  • Demonstrated an operating bandwidth of approximately 50 nm.
  • Miniaturized resonators enabled high resolution and bandwidth in a compact device.

Conclusions:

  • The developed integrated spectrometer offers high resolution and bandwidth in a compact, lightweight, and potentially high-speed package.
  • The silicon process compatible fabrication indicates significant potential for versatile microspectrometer applications.
  • This technology advances the field of integrated photonic devices for spectral sensing.