Jul 18, 2025
The review summarizes recent studies on D-shaped optical fibers and their recent applications in optical sensors. The configurations and working principles of D-shaped optical fibers
Jul 10, 2026
The sensitivity reaches 15065.92 nm/RIU, 3.96 times better than conventional U-shaped fiber SPR sensors. The sensor is compact designed with high sensitivity. There is significant potential for
Dec 17, 2025
Design of optical fiber structure and sensitive material coating are two effective performance improvement approaches for fiber optic surface plasmon resonance (SPR) sensors.
Oct 16, 2025
In particular, fiber optics bent into a U-shape present various advantages over other approaches and considerably improved performance in
Aug 28, 2025
Fiber optic sensors have gained popularity over the last few decades. This is due to their numerous advantages, such as good metrological
Aug 12, 2025
Abstract With the urgent demand of low concentration molecular detection, an innovative solution is presented to improve the sensitivity of surface plasmon resonance (SPR) sensors through
Jan 06, 2026
The distribution of nanoparticles on optical fiber significantly affects the optical fiber LSPR sensing performance. In this work, a robust and effective
Dec 30, 2025
This paper proposes a high-sensitivity U-shaped optical fiber sensor based on indium tin oxide (ITO) for surface plasmon resonance (SPR) sensing. Finite element simulations reveal that
Apr 19, 2026
Detailed guidance is provided on the fabrication of U-shaped fiber optic sensors. Furthermore, the chapter investigates the potential and versatility of U-type fiber optic SPR sensors
Dec 29, 2025
Numerous methods have been reported to further enhance the sensitivity of U-shaped fiber optic sensors towards external refractive index variation. Th
Mar 21, 2026
This paper is the second part of a review on U-shaped FOSs and discusses the sensing mechanisms, applications, possible improvements, and
Nov 19, 2025
Intrinsic U-shaped fiber optic sensors (FOSs) are well established in the field. With greater penetration depth and evanescent power, these sensors exhibit profound sensitivity and have supported a wide
Apr 22, 2026
The rapid growth of artificial intelligence (AI), data centers, and high-performance computing (HPC) has increased the demand for large bandwidth,
Oct 31, 2025
This chapter provides an in-depth exploration of U-type fiber optic sensors and their applications in SPR sensing. Initially, the fundamental principles of U-type fiber optic sensors are
Nov 14, 2025
Surface plasmon resonance (SPR) has many applications in optical fiber sensing. Herein, a single-mode optical fiber refractive index sensor based on the SPR is designed and analyzed. The sensor
Mar 15, 2026
A U-shaped optical fiber sensing structure with Au/ITO film layers was designed, utilizing a multimode fiber–single-mode fiber–multimode fiber (MMF-SMF-MMF) configuration to excite surface
Nov 19, 2025
A wide range of geometrical deformations of fiber optic sensors (FOSs) have been explored to improve their performance. In particular, fiber optics bent into a U-shape present various
May 13, 2026
Abstract In this paper, a review of recent studies on the optical fiber-based surface plasmon resonance (SPR) sensor and the sensitivity improvement based on specialty optical fibers
Sep 17, 2025
The high sensitivity of the proposed graphene-coated U-shaped fiber surface plasmon resonance sensor makes it a promising candidate for biosensing and chemical sensing.
Oct 04, 2025
This result shows that the prepared Au film optical fiber sensor has high sensitivity and good linearity in measuring the RI change, which is suitable for high-precision RI detection.
Jan 14, 2026
To achieve highly sensitive measurements of strain, a U-shaped optical fiber sensor (OFS) based on seven-core photonic crystal fiber (SCPCF) was designed. The proposed Mach-Zehnder-based
Feb 17, 2026
In this paper, a U-shaped SPR sensor coated with GeS nanosheets on the basis of a conventional gold film is proposed, as depicted in Fig. 1.
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