Spatial control of light via harmonic potential and atomic topological insulators

Countdown
0 days

Template for Manuscripts

Important Dates

Conference:

Aug. 18-20, 2018

Full Paper Due: Jul. 20, 2018

Abstract Due: Jul. 20, 2018

Audience Registration Due:
Aug. 18, 2018

Presentations of The Int'l Symposium on Photonics and Optoelectronics (SOPO 2016)

● Spatial control of light via harmonic potential and atomic topological insulators
Author(s)
Yiqi Zhang
Affiliation(s)
Xi'an Jiaotong University
KEYWORDS
harmonic potential, atomic topological insulators
ABSTRACT
We investigate spatial control of light, and the research contains two parts. The first part we focus on the influence from a harmonic potential [1], and the second part is about the atomic topological insulators [2]. The details are: 1. In a fractional Schrödinger equation with a harmonic potential, we find that the propagation of one- and two-dimensional input chirped Gaussian beams is not harmonic. In one dimension, the beam propagates along a zigzag trajectory in real space, which corresponds to a modulated anharmonic oscillation in momentum space. In two dimensions, the input Gaussian beam evolves into a breathing ring structure in both real and momentum spaces, which forms a filamented funnel-like aperiodic structure. The beams remain localized during propagation. 2. The interference of three coupling fields will split energy levels periodically, to form a periodic refractive index structure with honeycomb profile that can be adjusted by different frequency detunings and intensities of the coupling fields. This in turn will affect the appearance of Dirac cones in momentum space. When the honeycomb lattice sites are helically ordered along the propagation direction, gaps open at Dirac points, and one obtains a photonic Floquet topological insulator (PFTI) in an atomic vapor. Due to the confinement of edge states, beams will be able to move along the edge of the PFTI without scattering energy into the bulk. The formed PFTIs in atomic ensembles can be easily controlled and reconfigured by adjusting the frequency detunings, coupling field intensities, and higher-order nonlinear susceptibilities.