# Fano-like spectral features in nanodiamond solutions for biometric applications

## TL;DR

This paper reports Fano-like asymmetric spectral features in nanodiamond solutions resulting from multiple scattering and fluorescence processes, with potential applications in biosensing and bioengineering.

## Contribution

It demonstrates the presence of Fano-like spectral features in nanodiamond solutions and discusses their potential for biometric applications.

## Key findings

- Fano-like photoluminescence curves observed in nanodiamond solutions
- Asymmetric spectral features suitable for biosensing
- Potential for use in bio-sensors, bio-switches, and bio-filters

## Abstract

Fano resonance is a unique feature of interacting quantum systems, exhibiting resonance shapes distinctively different from conventional symmetric resonance curves. Recently, Fano resonances have been found in plasmonic nanoparticles, photonic crystals, and electromagnetic metamaterials. Here we report Fano-like photoluminiscence curves in nanodiamond solutions as a result of incoherent combination of two or more scattering and fluorescence processes. We argue that, analogously to Fano resonances, the steep asymmetric dispersion of the photoluminiscence profile in nanodiamond solutions, in combination with biologically-compatible spectral features characterizing nanodiamond fluorescence, can find promising biometric applications in several areas such as bio-sensors, bio-switches and bio-filters.