An ultra-broadband polarization filter and a stable temperature sensor based on a square-lattice gold-coated PCF with a different material-infiltrated core

IF 1.1 4区 物理与天体物理 Q4 OPTICS
Linghong Jiang, Jing Dai, Chao Wang, Shi Qiu, Wei Wang, Lantian Hou
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Abstract

A simple photonic crystal fiber (PCF) arranged in a square geometry with two gold-coated air holes and one material-infiltrated core is proposed. A broadband polarization filter and a temperature sensor can be achieved based on the same simple PCF structure, with a hollow core separately filled with liquid crystal and toluene. The polarization filtering and sensing properties of the proposed PCF were studied using the finite element method (FEM). Numerically results show that variations in the diameter of both the liquid crystal-infiltrated central hole and the cladding air holes have a slight effect on the polarization filter characteristics. The polarization filter can be effectively tuned in terms of the central wavelength, crosstalk, and bandwidth by adjusting the thickness of the gold film. The proposed PCF polarization filter with t = 22.5 nm has achieved a wide bandwidth of 1850 nm across wavelengths ranging from 1.2 to 3.05 μm for a fiber length of 50 μm, achieving a high value of polarization loss ratio (PLR) of 28,717 at λ = 1.31 μm with losses of 1723 dB/cm for y-polarization and 0.06 dB/cm for x-polarization. The y-polarized core mode in this design with t = 10 nm is rapidly attenuated, experiencing losses larger than 1340 dB/cm over wavelengths ranging from 1.9 to 3.0 μm; it also exhibits a bandwidth of 2200 nm with crosstalk greater than 20 dB when using a fiber length of 50 μm at wavelengths above 1.5 μm. Furthermore, a temperature sensor that utilizes toluene as its core material exhibits a consistent average sensitivity of 6.68 nm/°C for y-polarization and can detect temperatures ranging from − 10 to 40 °C. The sensor maintains stable sensitivity within ± 1% fluctuation of the gold film thickness in the sensing range of − 10 to 40 °C.

一种基于不同材料渗透核的方晶格金包覆PCF的超宽带偏振滤波器和稳定温度传感器
提出了一种具有两个包金气孔和一个材料渗透芯的简单光子晶体光纤(PCF)。基于相同的简单PCF结构,可以实现宽带偏振滤波器和温度传感器,其中空心核心分别填充液晶和甲苯。采用有限元法研究了所提出的PCF的极化滤波和传感性能。数值计算结果表明,液晶浸润中心孔和包层空气孔直径的变化对极化滤光器的特性影响不大。通过调整金膜的厚度,可以有效地对偏振滤波器的中心波长、串扰和带宽进行调谐。所设计的t = 22.5 nm的PCF偏振滤波器在光纤长度为50 μm时,在1.2 ~ 3.05 μm的波长范围内实现了1850 nm的宽带宽,在λ = 1.31 μm处实现了28,717的高偏振损耗比(PLR), y偏振损耗为1723 dB/cm, x偏振损耗为0.06 dB/cm。该设计中t = 10 nm的y极化核心模式衰减迅速,在1.9 ~ 3.0 μm波长范围内损耗大于1340 dB/cm;当使用长度为50 μm的光纤时,在波长大于1.5 μm时,其带宽为2200 nm,串扰大于20 dB。此外,利用甲苯作为核心材料的温度传感器在y偏振上具有6.68 nm/°C的平均灵敏度,并且可以检测到- 10到40°C的温度。在−10 ~ 40℃的传感范围内,传感器在金膜厚度±1%的波动范围内保持稳定的灵敏度。
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来源期刊
Optical Review
Optical Review 物理-光学
CiteScore
2.30
自引率
0.00%
发文量
62
审稿时长
2 months
期刊介绍: Optical Review is an international journal published by the Optical Society of Japan. The scope of the journal is: General and physical optics; Quantum optics and spectroscopy; Information optics; Photonics and optoelectronics; Biomedical photonics and biological optics; Lasers; Nonlinear optics; Optical systems and technologies; Optical materials and manufacturing technologies; Vision; Infrared and short wavelength optics; Cross-disciplinary areas such as environmental, energy, food, agriculture and space technologies; Other optical methods and applications.
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