Simulation of near-diffraction- and near-dispersion-free OAM pulses with controllable group velocity by combining multiple frequencies, each carrying a Bessel mode
Abstract
Optical pulses carrying orbital angular momentum (OAM) have recently gained interest. In general, it might be beneficial to simultaneously achieve: (i) minimum diffraction, (ii) minimum dispersion, and (iii) controllable group velocity. Here, we explore via simulation the generation of near-diffraction-free and near-dispersion-free OAM pulses with arbitrary group velocities by coherently combining multiple frequencies. Each frequency carries a specific Bessel mode with the same topological charge ( ℓ ) but different k r (spatial frequency) values based on space–time correlations. Moreover, we also find that (i) both positive and negative group velocities could be achieved and continuously controlled from the subluminal to superluminal values and (ii) when the ℓ is varied from 0 to 10, the simulated value of the group velocity remains the same. However, as the ℓ value increases, the pulse duration becomes longer for a given number of frequency lines.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Sep 15, 2021
- Source ID
- 10.1364/ol.434266
Entities
People
- Alan E. Willner
- Amir Minoofar
- Cong Liu
- Hao Song
- Haoqian Song
- Huibin Zhou
- Kai Pang
- Kaiheng Zou
- Moshe Tur
- Nanzhe Hu
- Runzhou Zhang
- Xinzhou Su
- Zhe Zhao
Organizations
- Office of Naval Research
- Tel Aviv University
- University of Southern California