A Reconfigurable Surface-Plasmon-Based Filter/Sensor Using D-Shaped Photonic Crystal Fiber

Abstract

A reconfigurable surface-plasmon-based filter/sensor using D-shaped photonic crystal fiber is proposed. Initially a D-shaped PCF is designed and optimized to realize the highly birefringence and by ensuring the single polarization filter. A tiny layer of silver is placed on the flat surface of the D-shaped fiber with a small half-circular opening to activate the plasmon modes. By the surface plasmon effect a maximum confinement loss of about 713 dB/cm is realized at the operating wavelength of 1.98 µm in X-polarized mode. At this wavelength the proposed fiber only allows Y-polarization and filters the X-polarization using surface plasmon resonance. It is also exhibiting maximum confinement loss of about 426 dB/cm at wavelength 1.92 µm wavelength for Y-polarization. At this 1.92 µm wavelength the proposed structure attenuated the Y-polarization completely and allowed X-polarization alone. The proposed PCF polarization filter can be extended as a sensor by adding an analyte outside this filter structure. The proposed sensor can detect even a small refractive index (RI) variation of analytes ranging from 1.34–1.37. This sensor provides the maximum sensitivity of about 5000 nm/RIU; it enables this sensor to be ideally suited for various biosensing and industrial applications.

Silver-TiO2 coated D-shaped photonic crystal fiber based SPR sensor for ultrasensitive refractive index detection: design and FEM analysis

“…The suggested D shaped PCF based SPR sensor comprises solely of silica material, and the RI of this material is determined using the Sellmeier equation [5],…”

“…The dielectric constant value of silver as a function of wavelength is calculated using the Drude dispersion model [5]. It can be expressed as follows:…”

“…SPR is a phenomenon that arises when light interacts with the surface of a metal and induces the collective oscillation of free electrons known as surface plasmons [4]. SPR is used to detect shifts in the wavelength caused by changes in the RI of the medium near the metal surface, making it a very efficient platform for sensing applications [5]. These advantages make plasmonic sensors an attractive platform for various sensing applications, including biomedical sensing [6], chemical analysis [7][8][9], food safety observation [10] and environmental monitoring [11].…”

A grating-modified broadband D-type photonic crystal fiber polarization filter

“…The evanescent field, i.e., surface plasmon polariton (SPP) can be excited at the metal surface to transfer the energy from core mode to SPP mode [11]. In recent years, SPR-PCFs have been used to polarization splitters, modulators, sensors, and filters [12][13][14][15][16]. These devices are widely used in environmental monitoring, medical medicine, biochemical sensing and many other fields [17,18].…”

Design of a photonic crystal fiber polarization beam splitter with simple structure and ultra-wide bandwidth

“…[1][2][3][4][5] It is mainly used to separate the light beams in the orthogonal polarization directions. [6][7][8][9] Over the past two decades, photonic crystal fiber (PCFs) have received great attention due to their unique optical characteristics. [10][11][12][13][14] In recent years, some researches have concentrated on the PBSs based on the dual-core PCFs (DC-PCFs).…”