Surface plasmon resonance under conditions of electromagnetically induced transparency

TL;DR

This paper proposes a surface plasmon resonance system utilizing electromagnetically induced transparency, revealing sharp spectral features and high sensitivity, with potential applications in magnetometry and biosensing.

Contribution

The study introduces a novel EIT-based SPR scheme with analytical formulas and demonstrates its high sensitivity and unique spectral properties.

Findings

Sharp dip in reflectivity spectrum at resonance

High sensitivity to laser frequency and atomic level shifts

Potential for advanced magnetometers and biosensors

Abstract

A scheme for a surface plasmon resonance system under conditions of electromagnetically induced transparency (EIT) is proposed. The system is composed of three layers: a prism, a thin metal film, and a hybrid dielectric consisting of EIT atoms and a background substance. A probe and a coupling laser beam are input. Corresponding analytical formulas are derived for the cases when one or both of the laser beams excite surface plasmon polaritons at the metal/dielectric interface. Under resonance conditions, an extremely sharp dip appears in the reflectivity-frequency spectrum of the probe field, revealing new properties of two-dimensional EIT. The reflectivity is extremely sensitive to shifts in the laser frequencies and atomic levels, and to variations of permittivity of the substrate. This EIT-SPR system may to be used for novel magnetometers and biosensors.