Pith Number

pith:5EEEFFZS

pith:2026:5EEEFFZS7TEYKCM65XFABEO5LO

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Dual-Polarization Quasi-BIC Refractive Index Sensing via Dielectric Symmetry Breaking in TiO$_2$-BeS Metasurfaces

Shoumik Debnath, Sudipta Saha

A TiO2 nanobar metasurface with a 20 nm BeS gap supports polarization-selective quasi-BIC and magnetic dipole resonances for refractive index sensing.

arxiv:2605.17549 v1 · 2026-05-17 · physics.optics

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Claims

C1strongest claim

Under TE illumination the structure supports a quasi-BIC resonance at 879.2 nm with Q=128, whereas TM excitation produces a magnetic dipole resonance at 910.8 nm with Q=36; for background refractive indices from 1.00 to 1.05 the TE and TM resonances exhibit sensitivities of 243.1 and 178.8 nm/RIU respectively.

C2weakest assumption

The numerical FDTD simulations accurately capture the electromagnetic behavior and material properties of the TiO2-BeS structure in a real fabricated device, including the precise effect of the 20 nm BeS gap on dielectric symmetry without unmodeled losses or fabrication imperfections.

C3one line summary

A TiO2-BeS metasurface uses dielectric symmetry breaking to produce polarization-selective quasi-BIC and magnetic dipole resonances with reported sensitivities of 243 and 179 nm/RIU in the near-infrared.

References

56 extracted · 56 resolved · 0 Pith anchors

[1] Surface plasmon resonance sensors for detection of chemical and biological species.Chem 2008

[2] Dielectric metasurfaces for next-generation optical biosensing: a comparison with plasmonic sensing.Nanotechnology, 34(40):402001, 2022 2022

[3] Andreas Tittl, Aleksandrs Leitis, Mingkai Liu, Filiz Yesilkoy, Duk-Yong Choi, Dragomir N. Neshev, Yuri S. Kivshar, and Hatice Altug. Imaging-based molecular barcoding with pixelated dielectric metasur 2018

[4] Andrey B. Evlyukhin, Sergey M. Novikov, Urs Zywietz, René Lynge Eriksen, Carsten Reinhardt, Sergey I. Bozhevolnyi, and Boris N. Chichkov. Demonstration of magnetic dipole resonances of dielectric nano 2012

[5] Arseniy I. Kuznetsov, Andrey E. Miroshnichenko, Mark L. Brongersma, Yuri S. Kivshar, and Boris Luk’yanchuk. Optically resonant dielectric nanostructures.Science, 354(6314):aag2472, 2016 2016

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Receipt and verification

First computed	2026-05-20T00:04:45.265124Z
Builder	pith-number-builder-2026-05-17-v1
Signature	Pith Ed25519 (`pith-v1-2026-05`) · public key
Schema	pith-number/v1.0

Canonical hash

e908429732fcc985099eedca0091dd5ba50544bf79616578e50dc841f38776a6

Aliases

arxiv: 2605.17549 · arxiv_version: 2605.17549v1 · doi: 10.48550/arxiv.2605.17549 · pith_short_12: 5EEEFFZS7TEY · pith_short_16: 5EEEFFZS7TEYKCM6 · pith_short_8: 5EEEFFZS

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Verify this Pith Number yourself

curl -sH 'Accept: application/ld+json' https://pith.science/pith/5EEEFFZS7TEYKCM65XFABEO5LO \
  | jq -c '.canonical_record' \
  | python3 -c "import sys,json,hashlib; b=json.dumps(json.loads(sys.stdin.read()), sort_keys=True, separators=(',',':'), ensure_ascii=False).encode(); print(hashlib.sha256(b).hexdigest())"
# expect: e908429732fcc985099eedca0091dd5ba50544bf79616578e50dc841f38776a6

Canonical record JSON

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    "abstract_canon_sha256": "2b58eab40d228e18d121ee3c9aa0a61f9d3c6cc3bfae44c70214604590e28511",
    "cross_cats_sorted": [],
    "license": "http://creativecommons.org/licenses/by/4.0/",
    "primary_cat": "physics.optics",
    "submitted_at": "2026-05-17T17:15:03Z",
    "title_canon_sha256": "22436edb35701fdaeac5d142547f4221dc3fa06c0b05eb017a83ada186707088"
  },
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  "source": {
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    "kind": "arxiv",
    "version": 1
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}