Enhancement of Goos–Hänchen shifts due to spontaneously generated coherence in a four-level Rydberg atom

Abstract

The impact of spontaneously generated coherence (SGC) on the Goos-Hänchen (GH) shifts of transmitted and reflected light beams from a cavity with a four-level rubidium atom with a Rydberg state are discussed. Using the quantum mechanical density matrix method, we first discuss the absorption and dispersion properties of the medium, then analyze the GH shifts of transmitted and reflected light beams, respectively. We find that quantum interference from SGC can modify the absorption-dispersion properties, which leads to enhancement in GH shifts in transmitted and reflected light beams. Moreover, the effects of coupling light and its detuning on the properties of GH shifts have been discussed.

High-Sensitivity Goos-Hänchen Shifts Sensor Based on BlueP-TMDCs-Graphene Heterostructure

“…When the phase of reflection coefficient changes significantly near the critical angle of total reflection, GH effect can be enhanced [4][5][6]. Due to the advantages of GH shift in precision measurement and optical sensing, new attention has been observed [7][8][9]. In the fields of optics, chemistry and sensors, GH shift has been widely discussed [10,11] and there is always a goal for researchers to obtain large GH shifts.…”

Beam Shift Modulation Based on Larmor Resonance in Graphene–VO2 Photonic Crystal

“…GH shift has subwavelength or even atomic-scale light evolution in nano-optics, which is difficult to directly observe in a single reflection. [6][7][8] Therefore, enhancement [9,10] and modulation [11,12] of GH shifts have attracted widespread attention from researchers.…”