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Complex wave-vectors in lossy materials: From polarisation-loss locking to bullseye metasurface

Research output: Chapter in Book/Report/Conference proceedingConference paperpeer-review

Original languageEnglish
Title of host publicationNanophotonics IX
EditorsDavid L. Andrews, Angus J. Bain, Jean-Michel Nunzi
ISBN (Electronic)9781510651388
E-pub ahead of print24 May 2022
EventNanophotonics IX 2022 - Virtual, Online
Duration: 9 May 202220 May 2022

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceNanophotonics IX 2022
CityVirtual, Online

Bibliographical note

Publisher Copyright: © 2022 SPIE. All rights reserved.

King's Authors


We investigate the connection between losses of a guided mode and polarisation of the associated evanescent waves in the Poincare sphere, demonstrating a "polarization-loss locking" in analogy to spin-momentum locking. From Fermi's golden rule, we investigate its implications for near-field directional coupling, via the introduction of a complex angular spectrum formalism. The use of complex wave-vector in the spectrum inspired us to investigate a method of achieving improved transmission of light across optically opaque materials by introducing a passive metasurface with a varying transmission phase and amplitude simultaneously.

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