# Low-Contrast BIC Metasurfaces with Quality Factors Exceeding 100,000

https://mdr.nims.go.jp/datasets/4cdd2cc9-2889-4825-b97d-c55e8fbe9452

## File

- [watanabe-et-al-2025-low-contrast-bic-metasurfaces-with-quality-factors-exceeding-100-000.pdf](https://mdr.nims.go.jp/filesets/dd433e94-a1ce-43ec-b21e-90c00d7699d0/download) ([Detail](https://mdr.nims.go.jp/filesets/dd433e94-a1ce-43ec-b21e-90c00d7699d0.md))
- [nl4c05880_si_001.pdf](https://mdr.nims.go.jp/filesets/bec6bcdb-282c-48f2-af12-cdda854f6cdb/download) ([Detail](https://mdr.nims.go.jp/filesets/bec6bcdb-282c-48f2-af12-cdda854f6cdb.md))

## Id

4cdd2cc9-2889-4825-b97d-c55e8fbe9452

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-02-19T12:04:11.291211Z

## Updated at

2025-02-23T13:49:30.428766Z

## Published at

2025-02-23T13:49:30.487664Z

## Doi



## First published url

https://doi.org/10.1021/acs.nanolett.4c05880

## Date published

2025-02-19

## Recorded date published

2025-2-19

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Low-Contrast BIC Metasurfaces with Quality Factors Exceeding 100,000
  title_type: original
  lang: en

## Description

- description: Dielectric metasurfaces operating at quasi-bound states in the continuum
    (qBICs) can achieve exceptionally high radiative quality (Q) factors by introducing
    small asymmetries into their unit cells. However, fabrication imperfections often
    impose major limitations on the experimentally observed Q factors. In this study,
    we experimentally demonstrate BIC metasurfaces with a Q factor of 101,000 under
    normal excitation of light in the telecom wavelength range achieved by employing
    low-contrast silicon pairs. Our findings show that such free-space accessible
    ultrahigh-Q factors can be attained by leveraging both the high radiative Q factors
    of higher-order qBIC modes and reduced scattering losses in shallow-etched designs.
    Additionally, we demonstrate stable sub-picometer-level wavelength fluctuations
    in water, with a limit of detection of 10–5 for environmental refractive index
    changes. The proposed approach can be extended to BIC metasurfaces with many other
    configurations and operating wavelengths for ultrahigh-Q applications in both
    fundamental physics and advanced devices.
  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
  ror: https://ror.org/026v1ze26
- name: Tadaaki Nagao
  role: author
  orcid: https://orcid.org/0000-0002-6746-2686
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26
- name: Masanobu Iwanaga
  role: author
  orcid: https://orcid.org/0000-0002-8930-6940
  organization: National Institute for Materials Science
  ror: https://ror.org/026v1ze26

## Contact agent



## Publisher

organization: American Chemical Society (ACS)

## Managing organization



## Keyword

- subject: Metasurfaces
  schema: not_defined
- subject: Bound states in the continuum
  schema: not_defined
- subject: Q factors
  schema: not_defined
- subject: All-dielectric
  schema: not_defined
- subject: Silicon
  schema: not_defined
- subject: Biosensors
  schema: not_defined

## Rights

- identifier: https://creativecommons.org/licenses/by/4.0/

## Other identifier(s)



## Data origin

- data_origin_type: other

## Embargo



## Journal

- title: Nano Letters
  issn: '15306984'
  volume: '25'
  issue: '7'
  start_page: 2777
  end_page: 2784

## Conference



## Related item



## Funding

- identifier: JP22K20496
  funder_name: Japan Society for the Promotion of Science
- identifier: 0361252-A
  funder_name: Iketani Science and Technology Foundation

## Instrument



## Instrument operator



## Instrument managing organization



## Measurement method



## Specimen



## Chemical composition



## Structure for specimen



## Structural feature for specimen



## Specific property for specimen



## Process for specimen treatment



## Computational method



## Energy level/transition state



## Software



## Custom property



## Fileset

- id: dd433e94-a1ce-43ec-b21e-90c00d7699d0
  filename: watanabe-et-al-2025-low-contrast-bic-metasurfaces-with-quality-factors-exceeding-100-000.pdf
  content_type: application/pdf
  size: 3901330
  md5: 5c613315131dab33d047d939e6eb766c
- id: bec6bcdb-282c-48f2-af12-cdda854f6cdb
  filename: nl4c05880_si_001.pdf
  content_type: application/pdf
  size: 5094382
  md5: 5d38d5683caa5f58fe318b3c698744d9

## Thumbnail

fileset_id: bec6bcdb-282c-48f2-af12-cdda854f6cdb
filename: nl4c05880_si_001.pdf