Fluorescence enhancement with the optical (bi-) conical antenna
Ahmad Mohammadi, Franziska Kaminski, Vahid Sandoghdar, Mario Agio

TL;DR
This paper explores how finite gold nanocones can serve as optical antennas to significantly enhance molecular fluorescence, outperforming nanorods and nanospheroids, with detailed analysis of their properties and optimal parameters.
Contribution
It provides a comparative analysis of gold nanocones versus other nanostructures for fluorescence enhancement, highlighting their superior performance and parameter dependencies.
Findings
Nanocones achieve higher fluorescence enhancement than nanorods and nanospheroids.
Maximum field and fluorescence enhancements occur at different nanocone parameters.
Optimal nanocone dimensions depend on specific enhancement goals.
Abstract
We investigate the properties of finite gold nanocones as optical antennas for enhancing molecular fluorescence. We compute the modification of the excitation rate, spontaneous emission rate, and quantum efficiency as a function of the nanocone base and length, showing that the maximum field and fluorescence enhancements do not occur for the same nanocone parameters. We compare the results with those for nanorods and nanospheroids and find that nanocones perform better.
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