Abstract
We propose an integrated photonic approach to generating guided space-time wave packets in a conventional multimode waveguide using multilevel interband photonic transitions. It can generate broadband propagation-invariant space-time wave packets with arbitrary group velocity and tailored field profiles. Our work reveals an important connection between the study of time-varying media and space-time optics.
Highlights
There have been emerging interests in exploring nontrivial optical phenomena in time-varying media [1,2,3,4,5,6,7,8,9,10]
We show that for this system the photonic transitions can result in the creation of space-time wave packets in the waveguide
The distribution of complex mode amplitudes {aν} must be precisely engineered to obtain a specific spatiotemporal field profile. (This point is further discussed in the Appendix.). We show that both of these challenges can be effectively overcome with the use of multilevel indirect photonic transitions in a waveguide
Summary
There have been emerging interests in exploring nontrivial optical phenomena in time-varying media [1,2,3,4,5,6,7,8,9,10]. We show that for this system the photonic transitions can result in the creation of space-time wave packets in the waveguide. Creating space-time wave packets in a waveguide [44,45,46] may lead to new opportunities in multimode integrated photonics. These wave packets can propagate at arbitrarily low group velocity but still possess broad spectral bandwidth. Generating a space-time wave packet in general is nontrivial due to the specific spatiotemporal correlation [30,47].
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