In this work we theoretically study the transduction ofthe Orbital Angular Momentum (OAM)lfor infraredpump lasers into the THz domain. In the case of opti-cal rectification, the transduction of OAM occurs onlythrough a spin-orbit interaction, with the selection ruleon the OAMl=0valid for any kind of polarizationof the pump, which means that there is no transfer ofOAM along the propagation axis. In the difference fre-quency generation the selection rule for the difference∆lbetween the OAM of the pump fields with linear orcircular polarization isl=∆l, whereaslranges from∆l−2to∆l+2in both the cases of radial and azimuthalpolarization. Moreover, for THz generation in the lat-ter case, high diffraction obtained with tightly focusedpumps yieldsltending to∆l±2, whileltends to zeroin the opposite case of large pump beams

Selection rules for the orbital angular momentum of optically-produced THz radiation / Curcio, Alessandro; Mou, Sen; Palumbo, Luigi; Lupi, Stefano; Petrarca, Massimo. - In: OPTICS LETTERS. - ISSN 0146-9592. - 46:7(2021), pp. 1514-1517. [10.1364/OL.416814]

Selection rules for the orbital angular momentum of optically-produced THz radiation

Curcio, Alessandro;Palumbo, Luigi;Lupi, Stefano;petrarca, massimo
2021

Abstract

In this work we theoretically study the transduction ofthe Orbital Angular Momentum (OAM)lfor infraredpump lasers into the THz domain. In the case of opti-cal rectification, the transduction of OAM occurs onlythrough a spin-orbit interaction, with the selection ruleon the OAMl=0valid for any kind of polarizationof the pump, which means that there is no transfer ofOAM along the propagation axis. In the difference fre-quency generation the selection rule for the difference∆lbetween the OAM of the pump fields with linear orcircular polarization isl=∆l, whereaslranges from∆l−2to∆l+2in both the cases of radial and azimuthalpolarization. Moreover, for THz generation in the lat-ter case, high diffraction obtained with tightly focusedpumps yieldsltending to∆l±2, whileltends to zeroin the opposite case of large pump beams
2021
non linear optic; Thz; structured light; laser
01 Pubblicazione su rivista::01a Articolo in rivista
Selection rules for the orbital angular momentum of optically-produced THz radiation / Curcio, Alessandro; Mou, Sen; Palumbo, Luigi; Lupi, Stefano; Petrarca, Massimo. - In: OPTICS LETTERS. - ISSN 0146-9592. - 46:7(2021), pp. 1514-1517. [10.1364/OL.416814]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1528835
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