Rotational Doppler shift upon reflection from a right angle prism

Rotational Doppler shift upon reflection from a right angle prism

This Letter reports the observation of a rotational Doppler shift on reflected beams carrying Orbital Angular Momentum (OAM). More precisely, we study the beat frequency of two optical beams carrying OAM with opposite signs, reflected on a right angle prism. We show that the interference of the two...

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Bibliographic Details
Published in:Applied physics letters Vol. 116; no. 22
Main Authors: Emile, O., Emile, J., Brousseau, C.
Format: Journal Article
Language:English
Published: Melville American Institute of Physics 01-06-2020
Subjects:
Angle of reflection
Angular momentum
Applied physics
Beat frequencies
Doppler effect
Engineering Sciences
Frequency shift
Object recognition
Physics
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Summary:This Letter reports the observation of a rotational Doppler shift on reflected beams carrying Orbital Angular Momentum (OAM). More precisely, we study the beat frequency of two optical beams carrying OAM with opposite signs, reflected on a right angle prism. We show that the interference of the two beams leads to a daisy-like pattern that rotates at twice the rotating frequency of the prism. The rotational Doppler frequency shift is equal to the OAM topological charge change times the rotational frequency. Possible applications in the positioning and detection of rotation of objects are then discussed.
ISSN:0003-6951
1077-3118
DOI:10.1063/5.0009396