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Event 

Title:
Daniel Tasca: How fast is a twisted photon?
When:
21.09.2018 11.00 h
Where:
Sala A5-01 - Niteroi
Categoría:
Seminários

Description

Seminário do grupo de Óptica e Informação Quântica

 

Data: Sexta-Feira 21/09/2018, Sala A5-01, 11 am.

 

Palestrante: Daniel Tasca (UFF)

Título: How fast is a twisted photon?

Abstract:  Recent measurements have highlighted that even in vacuum spatially shaped photons travel slower than c, the speed of monochromatic plane waves. Here we investigate the intrinsic delay introduced by “twisting” a photon, i.e., by intro- ducing orbital angular momentum (OAM), and measure the photon time of flight with a Hong–Ou–Mandel inter- ferometer. When all other parameters are held constant, the addition of OAM reduces the delay (accelerates) with respect to the same beam with no OAM. We support our results using a theoretical method to calculate the group velocity and gain an intuitive understanding of the measured OAM acceleration by considering a geometrical ray-tracing approach.

https://doi.org/10.1364/OPTICA.5.000682

Venue

Grupo:
Sala A5-01
Street:
Instituto de Física da UFF
ZIP:
24210-346
City:
Niteroi
State:
RJ
Country:
Country: br

Description

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