High-performance D-shaped photonic quasi-crystal fiber SPR sensor with Ag-TiO2 gratings

Qiang LIU; Xiaoxu ZHANG; Meili CHANG; Yudan SUN; Wei LIU; Tingting LV; Jingwei LV; Paul K. CHU; Chao LIU

doi:10.1364/AO.606848

High-performance D-shaped photonic quasi-crystal fiber SPR sensor with Ag-TiO₂ gratings

Qiang LIU
, Xiaoxu ZHANG
, Meili CHANG
, Yudan SUN
, Wei LIU
, Tingting LV
, Jingwei LV
, Paul K. CHU
, Chao LIU^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

Abstract

A D-shaped photonic quasi-crystal fiber (PQF) surface plasmon resonance (SPR) sensor is numerically designed and analyzed. By patterning a silver-titanium dioxide (Ag-TiO2) composite film into a grating structure, the localized surface plasmon resonance (LSPR) is enhanced and the full width at half-maximum (FWHM) is narrowed. The finite element method (FEM) is employed to optimize the structural parameters. In the refractive index (RI) range of 1.36–1.425, the sensor obtained a wavelength sensitivity of 15,800 nm/RIU and a maximum figure of merit (FOM) of 929.02 RIU⁻¹. A maximum amplitude sensitivity (AS) of 11,709.8 RIU⁻¹ is also obtained. With its excellent FOM and AS, the proposed sensor holds great application potential in chemistry, biomedicine, and environmental monitoring. These results demonstrate a promising strategy for designing high-performance SPR RI sensors. © 2026 Optica Publishing Group.

Original language	English
Pages (from-to)	7970-7978
Number of pages	9
Journal	Applied Optics
Volume	65
Issue number	23
Online published	7 Aug 2026
DOIs	https://doi.org/10.1364/AO.606848
Publication status	Published - 10 Aug 2026

Funding

Excellent Youth Scholars of Heilongjiang Province (YQJH2023077).

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@article{e39e53cc2cb844cdbfd0e52cfd91a99a,

title = "High-performance D-shaped photonic quasi-crystal fiber SPR sensor with Ag-TiO2 gratings",

abstract = "A D-shaped photonic quasi-crystal fiber (PQF) surface plasmon resonance (SPR) sensor is numerically designed and analyzed. By patterning a silver-titanium dioxide (Ag-TiO2) composite film into a grating structure, the localized surface plasmon resonance (LSPR) is enhanced and the full width at half-maximum (FWHM) is narrowed. The finite element method (FEM) is employed to optimize the structural parameters. In the refractive index (RI) range of 1.36–1.425, the sensor obtained a wavelength sensitivity of 15,800 nm/RIU and a maximum figure of merit (FOM) of 929.02 RIU−1. A maximum amplitude sensitivity (AS) of 11,709.8 RIU−1 is also obtained. With its excellent FOM and AS, the proposed sensor holds great application potential in chemistry, biomedicine, and environmental monitoring. These results demonstrate a promising strategy for designing high-performance SPR RI sensors. {\textcopyright} 2026 Optica Publishing Group.",

author = "Qiang LIU and Xiaoxu ZHANG and Meili CHANG and Yudan SUN and Wei LIU and Tingting LV and Jingwei LV and CHU, \{Paul K.\} and Chao LIU",

year = "2026",

month = aug,

day = "10",

doi = "10.1364/AO.606848",

language = "English",

volume = "65",

pages = "7970--7978",

journal = "Applied Optics",

issn = "1559-128X",

publisher = "Optical Society of America",

number = "23",

}

TY - JOUR

T1 - High-performance D-shaped photonic quasi-crystal fiber SPR sensor with Ag-TiO2 gratings

AU - LIU, Qiang

AU - ZHANG, Xiaoxu

AU - CHANG, Meili

AU - SUN, Yudan

AU - LIU, Wei

AU - LV, Tingting

AU - LV, Jingwei

AU - CHU, Paul K.

AU - LIU, Chao

PY - 2026/8/10

Y1 - 2026/8/10

N2 - A D-shaped photonic quasi-crystal fiber (PQF) surface plasmon resonance (SPR) sensor is numerically designed and analyzed. By patterning a silver-titanium dioxide (Ag-TiO2) composite film into a grating structure, the localized surface plasmon resonance (LSPR) is enhanced and the full width at half-maximum (FWHM) is narrowed. The finite element method (FEM) is employed to optimize the structural parameters. In the refractive index (RI) range of 1.36–1.425, the sensor obtained a wavelength sensitivity of 15,800 nm/RIU and a maximum figure of merit (FOM) of 929.02 RIU−1. A maximum amplitude sensitivity (AS) of 11,709.8 RIU−1 is also obtained. With its excellent FOM and AS, the proposed sensor holds great application potential in chemistry, biomedicine, and environmental monitoring. These results demonstrate a promising strategy for designing high-performance SPR RI sensors. © 2026 Optica Publishing Group.

AB - A D-shaped photonic quasi-crystal fiber (PQF) surface plasmon resonance (SPR) sensor is numerically designed and analyzed. By patterning a silver-titanium dioxide (Ag-TiO2) composite film into a grating structure, the localized surface plasmon resonance (LSPR) is enhanced and the full width at half-maximum (FWHM) is narrowed. The finite element method (FEM) is employed to optimize the structural parameters. In the refractive index (RI) range of 1.36–1.425, the sensor obtained a wavelength sensitivity of 15,800 nm/RIU and a maximum figure of merit (FOM) of 929.02 RIU−1. A maximum amplitude sensitivity (AS) of 11,709.8 RIU−1 is also obtained. With its excellent FOM and AS, the proposed sensor holds great application potential in chemistry, biomedicine, and environmental monitoring. These results demonstrate a promising strategy for designing high-performance SPR RI sensors. © 2026 Optica Publishing Group.

UR - https://www.webofscience.com/wos/woscc/full-record/WOS:001849145000031

U2 - 10.1364/AO.606848

DO - 10.1364/AO.606848

M3 - RGC 21 - Publication in refereed journal

SN - 1559-128X

VL - 65

SP - 7970

EP - 7978

JO - Applied Optics

JF - Applied Optics

IS - 23

ER -