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$Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing$

Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing

Published on: March 13, 2013

Microcavity enhanced optical absorption in subwavelength slits.

Changjun Min¹, Liu Yang, Georgios Veronis

¹Center for Computation and Technology, Louisiana State University, Baton Rouge, Louisiana 70803, USA.

|January 26, 2012

Summary

We developed a compact microcavity structure to enhance light absorption in plasmonic slits. This design improves light coupling and field enhancement, achieving a 9.3x greater absorption cross-section.

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Area of Science:

Plasmonics
Nanophotonics
Optical Metamaterials

Background:

Subwavelength plasmonic slits offer unique light-matter interaction properties.
Efficiently coupling light into these slits and enhancing absorption remains a challenge.

Purpose of the Study:

To introduce a novel compact submicron structure for enhanced light absorption in plasmonic slits.
To investigate the role of optical microcavities in improving light coupling and resonant field enhancement.

Main Methods:

Designing a submicron structure with multiple optical microcavities at the entrance and exit sides of a plasmonic slit.
Utilizing an absorbing material to fill the slit.
Simulating and analyzing the impedance matching, reflectivity, and absorption cross-section.

Main Results:

Microcavity structures at the slit entrance significantly enhance incident light coupling by improving impedance matching.
Microcavities increase reflectivity, leading to greater resonant field enhancement.
An optimized structure with two microcavities on each side achieved a ~9.3 times enhancement in absorption cross-section.

Conclusions:

The proposed microcavity-enhanced plasmonic slit structure offers a significant improvement in light absorption.
This design is particularly effective at optical communication wavelengths.
The findings pave the way for more efficient optical devices utilizing plasmonic structures.