Direct Transfer of Light’s Orbital Angular Momentum onto a Nonresonantly Excited Polariton Superfluid

Title
Direct Transfer of Light’s Orbital Angular Momentum onto a Nonresonantly Excited Polariton Superfluid
Authors
송진동강수석강항규Min-Sik KwonByoung Yong OhSu-Hyun GongJe-Hyung KimHyoungsoon ChoiYong-Hoon Cho
Keywords
Angular Momentum; Superfluid; Excited Polariton
Issue Date
2019-01
Publisher
Physical review letters
Citation
VOL 122, NO 4-0145302-7
Abstract
Recently, exciton polaritons in a semiconductor microcavity were found to condense into a coherent ground state much like a Bose-Einstein condensate and a superfluid. They have become a unique testbed for generating and manipulating quantum vortices in a driven-dissipative superfluid. Here, we generate an exciton-polariton condensate with a nonresonant Laguerre-Gaussian optical beam and verify the direct transfer of light’s orbital angular momentum to an exciton-polariton quantum fluid. Quantized vortices are found in spite of the large energy relaxation involved in nonresonant pumping. We identified phase singularity, density distribution, and energy eigenstates for the vortex states. Our observations confirm that nonresonant optical Laguerre-Gaussian beam can be used to manipulate chirality, topological charge, and stability of the nonequilibrium quantum fluid. These vortices are quite robust, only sensitive to the orbital angular momentum of light and not other parameters such as energy, intensity, size, or shape of the pump beam. Therefore, optical information can be transferred between the photon and exciton-polariton with ease and the technique is potentially useful to form the controllable network of multiple topological charges even in the presence of spectral randomness in a solid state system.
URI
http://pubs.kist.re.kr/handle/201004/69481
ISSN
0031-9007
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KIST Publication > Article
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