Related Experiment Video
Updated: May 25, 2026
08:12
Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
Published on: March 13, 2013
Optical microcavity: sensing down to single molecules and atoms.
Tomoyuki Yoshie1, Lingling Tang, Shu-Yu Su
1Electrical and Computer Engineering, Fitzpatrick Institute for Photonics, Duke University, Durham, NC 27708, USA. yoshie@duke.edu
Sensors (Basel, Switzerland)
|February 10, 2012
Summary
Optical micro-resonator sensors detect minute sample amounts by altering resonance frequency and quality (Q) factor. These sensors offer high sensitivity for single-molecule detection and future quantum optics applications.
Area of Science:
- Photonics and Sensing Technology
- Quantum Optics
Background:
- Dielectric, low-loss optical micro-resonators are crucial for sensitive detection.
- Resonance frequency and quality (Q) factor shifts indicate small perturbations.
Purpose of the Study:
- To review the fundamentals of optical micro-resonator sensing.
- To discuss microcavity designs, figures of merit, and future perspectives.
- To highlight key parameters for effective optical sensing applications.
Main Methods:
- Analysis of essential parameters: sensitivity, Q factor, minimum detectable index change, noise, microcavity size, and mode volume.
- Review of microcavity designs: whispering gallery mode, photonic crystal, and slot-type.
- Exploration of Surface Bloch modes and microcavity quantum electrodynamics (QED).
Main Results:
- Whispering gallery, photonic crystal, and slot-type microcavities provide compact, high-Q optical resonance modes.
- Surface Bloch modes on photonic crystals offer large field overlap and ultra-high-Q resonances.
- Quantum optics effects enable single-photo-level detection of single atoms/molecules via vacuum Rabi splitting.
Conclusions:
- Optical micro-resonator sensing is a powerful technique for detecting trace amounts of analytes, down to single molecules.
- Advanced designs like photonic crystals and quantum effects promise enhanced sensitivity and novel detection capabilities.
Related Concept Videos
01:18Imaging Biological Samples with Optical Microscopy
Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
01:22Overview of Microscopy Techniques
The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes that leveraged nonvisible light, such as fluorescence microscopy that uses an ultraviolet light source and electron microscopy that uses short-wavelength electron beams. These advances significantly improved magnification, image resolution, and contrast. By comparison, the...
01:08Atomic Force Microscopy
Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...