Severing the Link between Modal Order and Group Index Using Hybrid Guided Space-Time Modes DOI
Abbas Shiri, Ayman F. Abouraddy

ACS Photonics, Journal Year: 2022, Volume and Issue: 9(7), P. 2246 - 2255

Published: June 17, 2022

The structure of an optical waveguide determines the characteristics its guided modes, such as their spatial profile and group index. General features are shared by modes regardless waveguiding structure; for example, modal dispersion is inevitable in multimode waveguides, every mode experiences group-velocity dispersion, higher-order usually travel at lower velocities than lower-order counterparts. We show here that trends can be fundamentally altered a planar exploiting hybrid space-time whereupon eliminated link between order index altogether severed. Hybrid confined one-dimension waveguide, other underlying spatiotemporal spectral field itself. Direct measurements delays confirm low-loss, dispersion-free, each tuned away from same-order conventional mode, transverse size these varied independently These findings verified few-mode consisting 25.5 mm-long, 4-μm-thick silica film deposited on MgF2 substrate.

Language: Английский

Space-time wave packets localized in all dimensions DOI Creative Commons
Мurat Yessenov,

Justin Free,

Zhaozhong Chen

et al.

Nature Communications, Journal Year: 2022, Volume and Issue: 13(1)

Published: Aug. 5, 2022

Optical wave packets that are localized in space and time, but nevertheless overcome diffraction travel rigidly free space, a long sought-after field structure with applications ranging from microscopy remote sensing, to nonlinear quantum optics. However, synthesizing such requires introducing non-differentiable angular dispersion high spectral precision two transverse dimensions, capability has eluded optics date. Here, we describe an experimental strategy capable of sculpting the spatio-temporal spectrum generic pulsed beam by arbitrary radial chirp via two-dimensional conformal coordinate transformations spectrally resolved field. This procedure yields propagation-invariant `space-time' all tunable group velocity range $0.7c$ $1.8c$ endowed prescribed orbital momentum. By providing unprecedented flexibility three-dimensional optical fields, our promises be versatile platform for emerging enterprise space-time

Language: Английский

Citations

60
Severing the Link between Modal Order and Group Index Using Hybrid Guided Space-Time Modes DOI
Abbas Shiri, Ayman F. Abouraddy

ACS Photonics, Journal Year: 2022, Volume and Issue: 9(7), P. 2246 - 2255

Published: June 17, 2022

The structure of an optical waveguide determines the characteristics its guided modes, such as their spatial profile and group index. General features are shared by modes regardless waveguiding structure; for example, modal dispersion is inevitable in multimode waveguides, every mode experiences group-velocity dispersion, higher-order usually travel at lower velocities than lower-order counterparts. We show here that trends can be fundamentally altered a planar exploiting hybrid space-time whereupon eliminated link between order index altogether severed. Hybrid confined one-dimension waveguide, other underlying spatiotemporal spectral field itself. Direct measurements delays confirm low-loss, dispersion-free, each tuned away from same-order conventional mode, transverse size these varied independently These findings verified few-mode consisting 25.5 mm-long, 4-μm-thick silica film deposited on MgF2 substrate.

Language: Английский

Citations

8