Orbital-to-spin angular momentum conversion in inhomogeneous-anisotropic medium

T. Pradeep Chakravarthy; Nirmal K. Viswanathan

doi:10.1117/12.2648681

15 March 2023 Orbital-to-spin angular momentum conversion in inhomogeneous-anisotropic medium

T. Pradeep Chakravarthy, Nirmal K. Viswanathan

Proceedings Volume 12436, Complex Light and Optical Forces XVII; 124360T (2023) https://doi.org/10.1117/12.2648681
Event: SPIE OPTO, 2023, San Francisco, California, United States

Conference Poster

Abstract

While the spin-to-orbital angular momentum (AM) conversion and the spin-Hall effect are widely investigated effects of the spin-orbit interaction of light, the inverse orbital-to-spin AM conversion has rarely been paid attention to. The pair-wise first-order effects concerning the influence of the intrinsic and extrinsic orbital AM on the spin AM of light are a part of the orbital-to-spin AM conversion. These effects manifest as changes in the spin content under symmetric and broken symmetric conditions of the optical system. Furthermore, the second-order effects of the combined influence of the intrinsic and extrinsic orbital AM on the spin AM of light still remain unexplored. To this end, we demonstrate the orbital-to-spin AM conversion for off-axis propagation of spin-free optical vortex (OV) beam incident at different input positions on a GRIN rod and as a function of the topological charge of the OV beam. The changes in the output beam polarization measured and quantified through the S3 Stokes parameter is seen to increase as a function of the charge and off-axis position of the OV beam and exhibits asymmetry for + and – charges of the OV beam. The differential trajectory and the orbital-Berry phase for + and – charges OV beams lead to the measured variation of the S3 parameter. Understanding such intricate effects can potentially be helpful in various applications including optical communication, particle manipulation, light-guiding, and finding the signature patterns of fundamental interaction of light related to higher-order OV, HG, Poincaré, and vector-vortex beams.

Citation Download Citation

T. Pradeep Chakravarthy and Nirmal K. Viswanathan "Orbital-to-spin angular momentum conversion in inhomogeneous-anisotropic medium", Proc. SPIE 12436, Complex Light and Optical Forces XVII, 124360T (15 March 2023); https://doi.org/10.1117/12.2648681

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available