Design of Simple Structure Gas Sensor Based on Hybrid Photonic Crystal Fiber

Abstract

Abstract.A hybrid structure photonic crystal fiber gas sensor is presented in this paper to detect toxic and colorless gases. The guiding properties of proposed structure have been numerically investigated using finite element method (FEM). From the numerical results sensitivity of the proposed structure is enhanced to 15.67%. The Confinement loss or Leakage loss decreased to 1.12×10-7 by acquainting an octagonal ring of air holes in the outer cladding. The proposed H-PCF can be used in a wider range of wavelength from 0.8µm to 2 µm. The proposed structure has significantly lower confinement losses, higher sensitivity and is more flexible for its simplicity compared with early proposed PCFs.Keywords: Hybrid Photonic Crystal Fiber (H-PCF), Evanescent Field, Gas Sensor, Sensitivity, Finite Element Method and Confinement Loss. Hibrit Kaplamaları Photonıc Kristal Fibere Dayalı Basit Yapılı Gaz Sensörü TasarımıÖzet. Bir melez yapılı fotonik kristal fiber gaz sensörü, toksik ve renksiz gazları algılamak için, bu çalışmada sunulmuştur. Önerilen yapının yol gösterici özellikleri sayısal sonlu elemanlar metodu (FEM) kullanılarak incelenmiştir. Sayısal sonuçlardan önerilen yapı duyarlılığı %15.67'e yükseltilmiştir. Hapsetme kaybı ya da kaçak kaybı, dış cephe hava deliklerinin sekizgen halka yapısı ile 1.12 × 10 -7 değerine düşmüştür. Önerilen H-PCF, 0.8μm ile 2 um dalga boyu aralığında kullanılabilir. Önerilen yapı, daha düşük hapsi kayıpları, yüksek duyarlılık sahibidir ve önceden önerilen PCFs ile karşılaştırıldığında sadeliği için daha esnektir.

Design and optimization of photonic crystal fiber based sensor for gas condensate and air pollution monitoring

“…From Fig. 6(b), it is visualized that the confinement loss is decreases by enhancing pitch [34]. (Fig.…”

“…It can be seen that 56.65% relative sensitivity as well as 2.31×10 5 dB/m confinement loss can be obtained at the operating wavelength of 1.33 m. From the observation, it can be seen that the proposed H-PCF has a higher relative sensitivity compared with prior PCFs [14,[30][31][32]34]. For the central air holes, when enough light would be confined into the cladding region and interaction happens between light and gases, then sensitivity will be increased [31].…”

“…where I and I 0 are the output and input light intensities, respectively, α m is the absorption coefficient, l is the length of the H-PCF used for chemical detection, c is the concentration of the target samples, and r is a relative sensitivity coefficient defined as [34] eff…”

“…where n r are the refractive index of gas, n eff is the real part of the effective mode index, and f is the fraction of the total power located in the holes that can be expressed as [34] sample total Re( ) 100 Re( )…”

“…In our proposed H-PCF, the diameters of all five rings of cladding have been kept the same to interact the proper fabrication tolerance, which were defined as d [14]. The idea of the micro-structured core was introduced in [34]. In the proposed design, the angular displacement of two adjacent air holes in the cladding region is kept Photonic Sensors 236 60° to form a hexagonal structure.…”