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Trapping Light in Plain Sight: Embedded Photonic Eigenstates in Zero‐Index Metamaterials
Author(s) -
Monticone Francesco,
Doeleman Hugo M.,
Den Hollander Wouter,
Koenderink A. Femius,
Alù Andrea
Publication year - 2018
Publication title -
laser and photonics reviews
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.778
H-Index - 116
eISSN - 1863-8899
pISSN - 1863-8880
DOI - 10.1002/lpor.201700220
Subject(s) - metamaterial , photonics , eigenvalues and eigenvectors , physics , realization (probability) , sight , optics , quantum mechanics , mathematics , statistics
Confining electromagnetic energy is crucial to enhance light‐matter interactions, with important implications for science and technology. Here, the opportunities offered by trapping and confining light in open structures, based on the concept of embedded eigenstates within the radiation continuum enabled by zero‐index metamaterials, are discussed. Building upon the physical insights offered by the analysis, a general platform is put forward that allows the realization of extremely high field enhancements in open structures under external illumination. Structures supporting embedded eigenstates represent a rare example of physical systems in which extreme–in principle unbounded–responses can be tamed. The proposed design recipe to realize bound states in the continuum also offers a simple model that allows testing of important questions that surround the concept of embedded eigenstates, such as their effect on the local density of photonic states. The findings help clarify which nano‐optical and radio‐wave applications may benefit from this unusual and singular response.