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Article Dans Une Revue Applied Physics Letters Année : 2020

Rotational Doppler shift upon reflection from a right angle prism

Résumé

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.
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Dates et versions

hal-02880694 , version 1 (01-07-2020)

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Olivier Emile, Janine Emile, Christian Brousseau. Rotational Doppler shift upon reflection from a right angle prism. Applied Physics Letters, 2020, 116 (22), ⟨10.1063/5.0009396⟩. ⟨hal-02880694⟩
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