Enhanced spin–orbit coupling in an epsilon-near-zero material

Author:

Eismann Jörg S.12ORCID,Ackermann Lisa1ORCID,Kantor Brian,Nechayev Sergey1,Alam M. Zahirul3ORCID,Fickler Robert34ORCID,Boyd Robert W.356ORCID,Banzer Peter126ORCID

Affiliation:

1. Max Planck Institute for the Science of Light

2. Institute of Optics, Information and Photonics, University Erlangen-Nuremberg

3. Department of Physics, University of Ottawa

4. Photonics Laboratory, Physics Unit, Tampere University

5. University of Rochester

6. Max Planck-University of Ottawa Centre for Extreme and Quantum Photonics

Abstract

Light can carry both spin and orbital angular momentum. While it is known that a nonparaxial circularly polarized beam couples the spin angular momentum to orbital angular momentum, this phenomenon does not hold upon collimation of the field. With the rising interest in epsilon-near-zero photonics, integral ingredients to this field are the beam-shaping capabilities of such a regime. In this work, it is experimentally shown that a permanent conversion of spin-to-orbital angular momentum arises naturally from an incident circularly polarized field on an isotropic interface due to the asymmetry in the Fresnel coefficients. More significantly, the conversion efficiency can be substantially enhanced in the presence of an epsilon-near-zero film due to the unique Fresnel properties exhibited in such a regime. It is further shown that the conversion efficiency scales with the nonparaxiality of the incident field. Our study showcases the intriguing phenomena resulting from the combination of concepts as old as Fresnel coefficients and modern materials such as epsilon-near-zero films.

Funder

University of Graz

Natural Sciences and Engineering Research Council

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials

同舟云学术

1.学者识别学者识别

2.学术分析学术分析

3.人才评估人才评估

"同舟云学术"是以全球学者为主线,采集、加工和组织学术论文而形成的新型学术文献查询和分析系统,可以对全球学者进行文献检索和人才价值评估。用户可以通过关注某些学科领域的顶尖人物而持续追踪该领域的学科进展和研究前沿。经过近期的数据扩容,当前同舟云学术共收录了国内外主流学术期刊6万余种,收集的期刊论文及会议论文总量共计约1.5亿篇,并以每天添加12000余篇中外论文的速度递增。我们也可以为用户提供个性化、定制化的学者数据。欢迎来电咨询!咨询电话:010-8811{复制后删除}0370

www.globalauthorid.com

TOP

Copyright © 2019-2024 北京同舟云网络信息技术有限公司
京公网安备11010802033243号  京ICP备18003416号-3