Sensitivity of photonic crystal fiber grating sensors: biosensing, refractive index, strain, and temperature sensing

Abstract

We study the sensitivity of fiber grating sensors in the applications of strain, temperature, internal label-free biosensing, and internal refractive index sensing. It is shown that optical dispersion plays a central role in determining the sensitivity, and the dispersion may enhance or suppress sensitivity as well as change the sign of the resonant wavelength shifts. We propose a quality factor, Q, for characterizing LPGs.

Nonlinear fiber-optic strain sensor based on four-wave mixing in microstructured optical fiber

“…Numerical calculations predict that a sensitivity of −4.46 pm∕με can be achieved by optimizing the pump wavelength and power. This is more than four times higher than the sensitivity of FBG sensors at 1064 nm [1]. We expect that a further increase in sensitivity can be achieved by optimizing the MOF design.…”

“…Various fiber-optic schemes, including fiber gratings [1], MachZehnder interferometers [2], Sagnac interferometers [3], and Fabry-Perot interferometers [4], have been proposed and demonstrated for strain sensing. These sensors all use the linear properties of the fiber and rely on either specialty fibers, such as highly birefringent fibers, or postprocessing of the fibers, such as grating writing.…”

Refractive Index and Temperature Sensor Using HC-1550 Infiltrating by Different Liquid Crystal

“…When the temperature rises, it lead to a decrease in the LC density this is due to high temperature make the LC stretched and loss the strength of attraction between molecules and thus get bigger distances between particles and increases the internal molecular movement [5]. The measurements are recording from the oven regulator and Optical spectrum analyzer (OSA).…”

Ultrasensitive twin-core photonic bandgap fiber refractive index sensor

“…Most of the efforts have been concentrated on developing a so-called labelfree fiber sensor to detect tiny refractive index change. In this context, photonic cystal fibers (PCFs) have received considerable attention recently since PCF have the advantage to infiltrate analyte into the air holes and thereby create a strong light-matter interaction between the probing electromagnetic field and ambient analyte [1,2]. However, current label free fiber sensors, either based on conventional single mode fiber or PCFs, can not compete with mainstream label free optical sensors, e.g.…”

“…surface Plasmon resonance (SPR) sensors. The practical detection limit of fiber sensor is bottlenecked by 10 -5 RIU [1,2,3]. Meanwhile, we witness that, due to the flexibility of design and ease of fabrication, multi-core PCFs, especially the multi-core PBGFs, have attracted increasing interests for potential applications of optical communication and sensors [4,5,6].…”