# Optimum asymmetry for nanofabricated refractometric sensors at quasi-bound states in the continuum

https://mdr.nims.go.jp/datasets/e9f4db7b-b341-49ca-ad9d-5d9dac1c608f

## File

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- [supplementary_APL23-APL23-AR-03798.docx](https://mdr.nims.go.jp/filesets/21bbdf30-e986-408f-8a9c-81669ba9984e/download) ([Detail](https://mdr.nims.go.jp/filesets/21bbdf30-e986-408f-8a9c-81669ba9984e.md))

## Id

e9f4db7b-b341-49ca-ad9d-5d9dac1c608f

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2024-04-02T23:39:03.082096Z

## Updated at

2024-04-03T23:30:18.631390Z

## Published at

2024-04-03T23:30:18.717606Z

## Doi

https://doi.org/10.48505/nims.4464

## First published url

https://doi.org/10.1063/5.0158793

## Date published

2024-03-11

## Recorded date published

2024-3-11

## Resource type

journal_article

## Manuscript type

accepted_manuscript

## Collection



## Title

- title: Optimum asymmetry for nanofabricated refractometric sensors at quasi-bound
    states in the continuum
  title_type: original
  lang: en

## Description

- description: A symmetry-protected bound state in the continuum (BIC) is one of the
    bases for high-resolution photonic refractometric sensors that rely on spectral
    shifts. However, a trade-off exists between the quality (Q) factors and the resonance
    amplitudes when the asymmetries of the unit cell are changed, making it difficult
    to intuitively determine the optimal nanostructural geometry. In this study, we
    present a theoretical and experimental approach for identifying the asymmetry
    parameters of dielectric metasurfaces that yield the lowest limit of detection
    (LOD). Silicon-based metasurfaces with asymmetric pair-rod arrays are fabricated
    experimentally, and the minimum LOD is obtained under a critical coupling condition
    with equal radiative and nonradiative Q factors. The results agree well with the
    theoretical model derived from the temporal coupled-mode theory. We reveal that
    the LOD and the optimum asymmetry are significantly influenced by nonradiative
    losses in the nanostructure, emphasizing the importance of loss reduction in dielectric
    metasurfaces at quasi-BICs for high-performance refractometric sensors.
  description_type: abstract
  lang: und

## Creator

- name: Keisuke Watanabe
  role: author
  orcid: https://orcid.org/0000-0002-4285-2135
  organization: National Institute for Materials Science
- name: Masanobu Iwanaga
  role: author
  orcid: https://orcid.org/0000-0002-8930-6940
  organization: National Institute for Materials Science

## Contact agent



## Publisher

organization: AIP Publishing

## Managing organization



## Keyword

- subject: metasurfaces
  schema: not_defined
- subject: bound states in the continuum
  schema: not_defined
- subject: BIC
  schema: not_defined
- subject: biosensors
  schema: not_defined

## Rights

- description: This article may be downloaded for personal use only. Any other use
    requires prior permission of the author and AIP Publishing. This article appeared
    in Keisuke Watanabe et al., Appl. Phys. Lett. 124, 111705 (2024) and may be found
    at https://doi.org/10.1063/5.0158793.
  identifier: http://rightsstatements.org/vocab/InC/1.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Applied Physics Letters
  issn: '00036951'
  volume: '124'
  article_number: '111705'

## Conference



## Related item



## Funding

- identifier: JP22K20496
  funder_name: Japan Society for the Promotion of Science
- funder_name: Murata Science Foundation

## Instrument



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## Fileset

- id: 94230fad-0204-4f05-9150-37987c6e5f51
  filename: manuscript_APL23-APL23-AR-03798.docx
  content_type: application/vnd.openxmlformats-officedocument.wordprocessingml.document
  size: 2089566
  md5: e8850af4e6ea4c2f2055c225b489e40c
- id: 21bbdf30-e986-408f-8a9c-81669ba9984e
  filename: supplementary_APL23-APL23-AR-03798.docx
  content_type: application/vnd.openxmlformats-officedocument.wordprocessingml.document
  size: 1164891
  md5: 9a927b39d68f7b3f1c1dac8368c2db9d

## Thumbnail

fileset_id: 94230fad-0204-4f05-9150-37987c6e5f51
filename: manuscript_APL23-APL23-AR-03798.docx