Focusing of vector beams with fractional-order azimutal polarization

Vladislav D. Zaitcev; Sergey S. Stafeev; Victor V. Kotlyar

doi:10.1117/12.2593076

22 June 2021 Focusing of vector beams with fractional-order azimutal polarization

Vladislav D. Zaitcev, Sergey S. Stafeev, Victor V. Kotlyar

Proceedings Volume 11793, Optical Technologies for Telecommunications 2020; 117930O (2021) https://doi.org/10.1117/12.2593076
Event: Eighteenth International Scientific and Technical Conference "Optical Technologies for Communications", 2020, Samara, Russian Federation

Abstract

By simulating sharp focusing of vector beams with azimuthal polarization of fractional order 0 < m <1 (m = 1 is azimuthal polarization, m = 0 is linear polarization), it was shown that the shape of the intensity distribution in the focal spot changes from annular (m = 1) to round (m = 0.5) and then to elliptical ring (m = 0). The opposite changes we can see for the shape of the distribution of the longitudinal component of the Poynting vector (energy flux) in the focal spot: from annular (m = 1) to elliptical (m = 0.5) and then to circular ring (m = 0). The diameter of the focal spot at full width at half maximum for a beam with azimuthal polarization (m = 1) with an optical vortex of the first order for a numerical aperture NA = 0.95 is 0.46 of the wavelength, and the diameter of the axial energy flux for linearly polarized light (m = 0) is 0.45 of the wavelength. Because of this, the answers to the questions: Whether the focal spot is round or elliptical and whether the focal spot is minimal: with azimuthal polarization with a vortex or with linear polarization without a vortex, depend on whether we are considering the intensity at the focus or the energy flow.

Citation Download Citation

Vladislav D. Zaitcev, Sergey S. Stafeev, and Victor V. Kotlyar "Focusing of vector beams with fractional-order azimutal polarization", Proc. SPIE 11793, Optical Technologies for Telecommunications 2020, 117930O (22 June 2021); https://doi.org/10.1117/12.2593076

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