# Vibrational Mode-Selective Infrared Spectroscopy at the Monolayer Level Using Silicon Quasi-Bound States in the Continuum

https://mdr.nims.go.jp/datasets/034a33c4-9a42-4044-b4ee-e2df2c927a6f

## Files

- [vibrational-mode-selective-infrared-spectroscopy-at-the-monolayer-level-using-silicon-quasi-bound-states-in-the.pdf](https://mdr.nims.go.jp/filesets/bb9b6694-3da9-43c1-a06a-762956bd62f5/download) ([Detail](https://mdr.nims.go.jp/filesets/bb9b6694-3da9-43c1-a06a-762956bd62f5.md))

## Id

034a33c4-9a42-4044-b4ee-e2df2c927a6f

## Local identifier



## Visibility

open_to_public

## State

published

## Created at

2025-12-17T09:34:18.675682Z

## Updated at

2025-12-18T23:31:09.885635Z

## Published at

2025-12-18T10:08:18.238851Z

## Doi



## First published url

https://doi.org/10.1021/acsphotonics.5c02042

## Date published

2025-12-17

## Recorded date published

2025-12-17

## Resource type

journal_article

## Manuscript type

vor

## Collection



## Title

- title: Vibrational Mode-Selective Infrared Spectroscopy at the Monolayer Level Using
    Silicon Quasi-Bound States in the Continuum
  title_type: original
  lang: en

## Description

- description: Surface-enhanced infrared absorption (SEIRA) boosts the sensitivity
    of infrared spectroscopy by leveraging the strong light–matter interactions induced
    by localized optical resonances in nanostructures. While most SEIRA studies have
    focused on metallic nanostructures, all-dielectric alternatives eliminate the
    unwanted optical ohmic losses as well as the collisional damping of the plasma
    waves, potentially enabling higher-performance and lower-cost vibrational infrared
    spectroscopic platforms. In this study, we fabricate silicon-based all-dielectric
    metasurfaces that support quasi-bound states in the continuum and systematically
    investigate their SEIRA performance by varying the thickness of the spin-coated
    polymethyl methacrylate films, radiative quality factors, and spectral detuning.
    Furthermore, we quantify the enhancement factor for vibrational signals originating
    from the surface-adsorbed molecules, achieving a SEIRA enhancement factor exceeding
    10^4, which corresponds to the sensitivity at the monolayer level. Our findings
    provide practical design principles for metal-free, highly sensitive, and wavelength-selective
    infrared spectroscopy systems based on low-loss dielectric metasurfaces.
  description_type: abstract
  lang: und

## Creator

- name: Keisuke Watanabe
  role: author
  orcid: https://orcid.org/0000-0002-4285-2135
- name: Tadaaki Nagao
  role: author
  orcid: https://orcid.org/0000-0002-6746-2686

## Contact agent



## Publisher

organization: American Chemical Society (ACS)

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## Keyword

- subject: BIC
  schema: not_defined
- subject: metasurfaces
  schema: not_defined
- subject: SEIRA
  schema: not_defined
- subject: silicon
  schema: not_defined

## Rights

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

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## Embargo



## Journal

- title: ACS Photonics
  issn: '23304022'
  volume: '12'
  issue: '12'
  start_page: 6876
  end_page: 6883

## Conference



## Related item



## Funding

- identifier: JP22K20496
  funder_name: Japan Society for the Promotion of Science
- identifier: JP24K17583
  funder_name: Japan Society for the Promotion of Science

## Instrument



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## Specimen



## Chemical composition



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## Fileset

- id: bb9b6694-3da9-43c1-a06a-762956bd62f5
  filename: vibrational-mode-selective-infrared-spectroscopy-at-the-monolayer-level-using-silicon-quasi-bound-states-in-the.pdf
  content_type: application/pdf
  size: 5336372
  md5: 599d685635f3d7ac6449d6f1670c721e

## Thumbnail

fileset_id: bb9b6694-3da9-43c1-a06a-762956bd62f5
filename: vibrational-mode-selective-infrared-spectroscopy-at-the-monolayer-level-using-silicon-quasi-bound-states-in-the.pdf