Anomalous refraction of spatio-temporally structured wave-packets (Conference Presentation)

Murat Yessenov; Basanta Bhaduri; Ayman F. Abouraddy

doi:10.1117/12.2556663

9 March 2020 Anomalous refraction of spatio-temporally structured wave-packets (Conference Presentation)

Murat Yessenov, Basanta Bhaduri, Ayman F. Abouraddy

Proceedings Volume 11297, Complex Light and Optical Forces XIV; 1129703 (2020) https://doi.org/10.1117/12.2556663
Event: SPIE OPTO, 2020, San Francisco, California, United States

Abstract

Following Fermat's principle, it is intuitively assumed that a pulse always slows down while traveling from low index to high index materials. Here we show that structuring a wave-packet both spatially and temporally challenges this well-established intuition, unveiling anomalous refractive phenomena – group velocity of a pulse increases while traversing denser media. We present a theoretical formulation as well as an experimental demonstration of this remarkable behavior by making use of 'space-time' wave-packets – propagation-invariant pulsed beam endowed with tight correlations between spatial and temporal degrees-of-freedom. We observe the boost of group velocity at the interface of various optical materials (BK7, MgF2, and Sapphire) with air.

Conference Presentation

Citation Download Citation

Murat Yessenov, Basanta Bhaduri, and Ayman F. Abouraddy "Anomalous refraction of spatio-temporally structured wave-packets (Conference Presentation)", Proc. SPIE 11297, Complex Light and Optical Forces XIV, 1129703 (9 March 2020); https://doi.org/10.1117/12.2556663

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KEYWORDS

Refraction

Interfaces

Refractive index

Beam propagation method

Interferometry

Picosecond phenomena

Spatial frequencies

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