Enabling infinite Q factors in absorbing optical systems

Radoslaw Kolkowski; Andriy Shevchenko

doi:10.1515/nanoph-2023-0281

Enabling infinite Q factors in absorbing optical systems

Radoslaw Kolkowski^*
, Andriy Shevchenko

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

16 Citations (Scopus)

72 Downloads (Pure)

Abstract

Resonant optical structures have widespread applications in science and technology. However, their quality (Q) factors can be significantly deteriorated, if some of their parts exhibit optical absorption. Here, we show that by coupling a lossy mode of such a structure to two independent lossless modes, one can create a nonradiating and absorption-free bound state in the continuum (BIC). The Q factor of such a BIC is theoretically unlimited despite interaction with an absorbing structure. We use this mechanism to design a plasmonic metasurface with Q factors that are close to 107 in the visible spectral range. The proposed mechanism is general and can be used to engineer ultrahigh-Q resonances in various systems containing absorbing structures.

Original language	English
Pages (from-to)	3443–3454
Journal	Nanophotonics
Volume	12
Issue number	17
DOIs	https://doi.org/10.1515/nanoph-2023-0281
Publication status	Published - 1 Aug 2023
MoE publication type	A1 Journal article-refereed

Funding

Research funding: The authors acknowledge the support of the Research Council of Finland (Grants No. 347449 and 353758) and the Flagship of Photonics Research and Innovation (PREIN) funded by the Research Council of Finland (Grant No. 320167). For computational resources, the authors acknowledge the Aalto University School of Science “Science-IT” project and CSC – IT Center for Science, Finland.

Keywords

bound state in the continuum
optical absorption
resonant metasurface

Access to Document

10.1515/nanoph-2023-0281Licence: CC BY

SCI_Kolkowski_etal_Nanophotonics_2023Final published version, 5.26 MBLicence: CC BY

Cite this

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title = "Enabling infinite Q factors in absorbing optical systems",

abstract = "Resonant optical structures have widespread applications in science and technology. However, their quality (Q) factors can be significantly deteriorated, if some of their parts exhibit optical absorption. Here, we show that by coupling a lossy mode of such a structure to two independent lossless modes, one can create a nonradiating and absorption-free bound state in the continuum (BIC). The Q factor of such a BIC is theoretically unlimited despite interaction with an absorbing structure. We use this mechanism to design a plasmonic metasurface with Q factors that are close to 107 in the visible spectral range. The proposed mechanism is general and can be used to engineer ultrahigh-Q resonances in various systems containing absorbing structures.",

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N2 - Resonant optical structures have widespread applications in science and technology. However, their quality (Q) factors can be significantly deteriorated, if some of their parts exhibit optical absorption. Here, we show that by coupling a lossy mode of such a structure to two independent lossless modes, one can create a nonradiating and absorption-free bound state in the continuum (BIC). The Q factor of such a BIC is theoretically unlimited despite interaction with an absorbing structure. We use this mechanism to design a plasmonic metasurface with Q factors that are close to 107 in the visible spectral range. The proposed mechanism is general and can be used to engineer ultrahigh-Q resonances in various systems containing absorbing structures.

AB - Resonant optical structures have widespread applications in science and technology. However, their quality (Q) factors can be significantly deteriorated, if some of their parts exhibit optical absorption. Here, we show that by coupling a lossy mode of such a structure to two independent lossless modes, one can create a nonradiating and absorption-free bound state in the continuum (BIC). The Q factor of such a BIC is theoretically unlimited despite interaction with an absorbing structure. We use this mechanism to design a plasmonic metasurface with Q factors that are close to 107 in the visible spectral range. The proposed mechanism is general and can be used to engineer ultrahigh-Q resonances in various systems containing absorbing structures.

KW - bound state in the continuum

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KW - resonant metasurface

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JO - Nanophotonics

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ER -

Enabling infinite Q factors in absorbing optical systems

Abstract

Funding

Keywords

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Replication package for "Enabling infinite Q factors in absorbing optical systems", 2023

-: Kolkowski Radoslaw AT-palkka

-: Kolkowski Radoslaw AT-kulut

PREIN: Photonics Research and Innovation

Science-IT

Optical Resonator Design Eliminates Loss

Cite this

Enabling infinite Q factors in absorbing optical systems

Abstract

Funding

Keywords

Access to Document

Other files and links

Fingerprint

Datasets

Replication package for "Enabling infinite Q factors in absorbing optical systems", 2023

Projects

-: Kolkowski Radoslaw AT-palkka

-: Kolkowski Radoslaw AT-kulut

PREIN: Photonics Research and Innovation

Equipment

Science-IT

Press/Media

Optical Resonator Design Eliminates Loss

Cite this