- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Photonic Crystal Fiber Infiltrated with Carbon Tetrachloride for Supercontinuum Generation
摘要： Supercontinuum generation in a hollow core photonic crystal fiber infiltrated with carbon tetrachloride was verified numerically and experimentally with femtosecond laser. Carbon tetrachloride (CCl4) infiltrated core of photonic crystal fiber (PCF), as well as other liquid core PCFs, have a large potential for supercontinuum (SC) generation, because they can combinate the unique properties of PCFs, i.e. modify dispersion characteristics by the individually changing of photonic cladding parameters of the PCF, optimize effective mode area and control mode properties, with high nonlinearity of liquid as a core medium. Moreover, using liquid core PCFs for SC generation can reduce requirements on high peak power and complexity of pump laser systems [1]. Carbon tetrachloride is one of the most interesting liquid in this area because it has very high nonlinear refractive index n2 = 1.53*10-19 (m2/W) @ λ=1.064 μm [2], it is highly transparent from visible range to mid-infrared (MIR) [3], and its linear refractive index is similar to silica – therefore development of single mode fibers compatible with standard silica fibers is feasible. Therefore, carbon tetrachloride core PCFs gives a large opportunities to obtain the broadband SC generation in infrared.
关键词： femtosecond laser,photonic crystal fiber,carbon tetrachloride,supercontinuum generation
更新于2025-09-16 10:30:52
-
[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Enhanced Magneto-Optical Effects in Magnetic Photonic Crystal Fiber Based on Yttrium Iron Garnet
摘要： In this paper, a kind of magnetic photonic crystal fiber of Yttrium iron garnet (YIG) is presented. The influence of gyrotropy on TE-TM mode conversion is analysed, which depends on Faraday rotation. The structure parameters are simulated and optimized. The optimum efficiency of 93.57% is obtained. Faraday rotation and modal birefringence have been calculated by varying gyrotropy from 0.01 to 0.04. The numerical results reveal an increased Faraday rotation and a reduced modal birefringence of 10-5. The enhanced properties of the structure could improve photonic devices performance, which make it suitable for magneto-optical isolators.
关键词： Modal birefringence,Faraday rotation,YIG,Magnetic photonic crystal fiber,Mode conversion
更新于2025-09-16 10:30:52
-
[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Supercontinuum Generation in Cascaded Photonic Crystal Fiber Tapers
摘要： In this paper, we propose two-stage cascaded photonic crystal fiber tapers for the supercontinuum (SC) generation. The nonlinear evolution of the SC generation is numerically investigated when pump pulses with different peak powers are used.
关键词： supercontinuum generation,Nonlinear,photonic crystal fiber taper
更新于2025-09-16 10:30:52
-
[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - High-power linearly-polarized supercontinuum generation from few-mode polarization-maintaining photonic crystal fiber
摘要： We demonstrate a high-power broadband linearly-polarized supercontinuum (LP-SC) laser source by coupling the output of a polarization-maintaining picosecond master oscillator power amplifier (PM-MOPA) at 1064 nm into a few-mode polarization-maintaining photonic crystal fiber (PM-PCF). The PM-MOPA delivers 150 ps pulses at a high repetition rate of 80 MHz with 120.4 W average output power. The short wavelength band of LP-SC is extended from 580 nm to 480 nm with the aid of intermodal four wave mixing (FWM). The spectrum is finally broadened to 480 -2400 nm with a maximum average power of 77.4 W. To our knowledge, this is the first demonstration of such a high average power LP-SC generated from PM-PCF with a wide spectrum.
关键词： few-mode,linearly-polarized,Supercontinuum,photonic crystal fiber
更新于2025-09-16 10:30:52
-
Analysis of Dual-Channel Simultaneous Detection of Photonic Crystal Fiber Sensors
摘要： Photonic crystal fiber (PCF) sensor based on surface plasmon resonance (SPR) has broad application prospects in the detection of biological proteins, DNA/RNA, and toxic chemicals. However, there are many problems in application process, such as inhomogeneous metal nanofilm, low filling speed of analyte, and low detection efficiency, which limit the development of this technology. In this paper, a dual-channel PCF sensor based on simultaneous detection which has the advantages of SPR and PCF was proposed to improve the detection efficiency of samples. By optimizing the dielectric layer, the identification ability of channels is effectively improved, and wavelength sensitivities of two channels could reached 11,600 nm/RIU and 10,600 nm/RIU, respectively. Based on this, the horizontal polishing structure was proposed, then the PCF could be immersed in the liquid analyte directly, which can reduce the difficulty of coating and avoid the filling of microfluid. The proposed structure has important scientific significance and application value to promote the practical development of SPR technology with high sensitivity in biochemical sensing and reduce the process complexity in the detection of multi-sample.
关键词： Photonic crystal fiber,Wavelength sensitivity,Surface plasmon resonance
更新于2025-09-16 10:30:52
-
Plasmonic Temperature Sensor Using D-shaped Photonic Crystal Fiber
摘要： Simple structure and high sensitivity with a broad detection range are highly desirable for temperature sensor. This work presents a highly sensitive plasmonic sensor based on D-shaped photonic crystal fiber (PCF) in the near infrared region (900-1900 nm) for temperature measurement. The proposed sensor is designed by finite element method (FEM) based simulation tool and sensing properties are investigated by means of wavelength interrogation method (WIM). To support the surface plasmon oscillation, 45 nm gold film is deposited on the flat portion of the D-shaped PCF which consists of pure silica. Benzene is used as the temperature sensitive material that offers large propagation loss (PL) peak shift. Simulation outcome shows that the maximum possible sensitivity of 110 nm/°C in the temperature range from 10 °C to 70 °C. To our knowledge, the achieved sensitivity is the highest for temperature sensing in the existing literature. In addition, the proposed sensor exhibits the maximum figure of merit (FOM) of 5.5 /°C, resolution of 9.09 × 10–4 °C, and excellent fitting characteristics of PL peak wavelengths. Moreover, low PL of the proposed sensor helps to extend the sensor length up to few centimeters. Such excellent results and wider temperature range make sure that the proposed sensor can be an appropriate choice for temperature measurement even in the remote sensing application.
关键词： sensor,photonic crystal fiber,plasmonics
更新于2025-09-16 10:30:52
-
[IEEE 2019 22nd International Conference on Electrical Machines and Systems (ICEMS) - Harbin, China (2019.8.11-2019.8.14)] 2019 22nd International Conference on Electrical Machines and Systems (ICEMS) - Graphene/Gold Based Photonic Crystal Fiber Plasmonic Temperature Sensor for Electric Vehicle Applications
摘要： An octagonal photonic crystal fiber (PCF) based surface plasmon resonance (SPR) temperature sensor is proposed where graphene/gold and ethanol are used as a plasmonic material and sensing medium, respectively. The proposed PCF based SPR temperature sensor is numerically simulated by finite element method (FEM) based simulation tool and result is processed by using MATLAB environment. Numerical results indicate that the proposed temperature sensor shows the possible maximum wavelength/temperature sensitivity of 1450 pm/oC for graphene plasmonic and 2500 pm/oC for gold plasmonic, calculated using wavelength interrogation method. It is anticipated that the proposed SPR temperature sensor can be reliably applied to monitor the temperature of battery used for electric vehicles (EVs), transformer oil etc.
关键词： temperature sensor,gold,surface plasmon resonance,photonic crystal fiber,electric vehicles,graphene
更新于2025-09-12 10:27:22
-
Development of Highly Reliable SERS‐active Photonic Crystal Fiber Probe and its Application in the Detection of Ovarian Cancer Biomarker in Cyst Fluid
摘要： Conventionally Surface enhanced Raman spectroscopy (SERS) is realized by adsorbing analytes onto nano-roughened planar substrate coated with noble metals (silver or gold) or their colloidal nanoparticles (NPs). Nano scale irregularities in such substrates/NPs could lead to SERS sensors with poor reproducibility and repeatability. Herein, we demonstrate a suspended core photonic crystal fiber (PCF) based SERS sensor with extremely high reproducibility and repeatability in measurement with a relative standard deviation of only 1.5% and 4.6% respectively, which makes it more reliable than any existing SERS sensor platforms. In addition, our platform could improve the detection sensitivity owing to the increased interaction area between the guided light and the analyte, which is incorporated into the holes that runs along the length of the PCF. Numerical calculation established the significance of the interplay between light coupling efficiency and evanescent field distribution, which could eventually determine the sensitivity and reliability of the developed SERS active-PCF sensor. As a proof of concept, using this sensor, we demonstrated the detection of haptoglobin, a biomarker for ovarian cancer, contained within the ovarian cyst fluid, which facilitated in differentiating the stages of the cancer. We envision that with necessary refinements, this platform could potentially be translated as a next generation highly sensitive SERS-active opto-fluidic biopsy needle for the detection of biomarkers in body fluids.
关键词： reproducibility and repeatability in measurement,Surface enhanced Raman scattering,photonic crystal fiber,biopsy needle,protein sensing,ovarian cancer
更新于2025-09-12 10:27:22
-
Design of terahertz spectroscopy based optical sensor for chemical detection
摘要： In this article, a new design of circular cladding with a rotated-hexacore in photonic crystal fiber (RH-CPCF) has been suggested for chemical sensing application in the THz regime. The five layers circular cladding and two layers rotated-hexacore in circular shape are designed here. All numerical results are obtained with a procedure of finite element method and perfectly match layered boundary condition in terahertz (THz) wave propagation. After the simulation result, the proposed RH-CPCF shows the high relative sensitivity is 76.44%, 77.16% and 73.20% for three chemicals such as Ethanol (n = 1.354), Benzene (n = 1.366) and Water (n = 1.330) at 1 THz. On the other hand, the low confinement losses are 2.33 × 10?03 dB/m, 3.07 × 10?06 dB/m and 2.84 × 10?02 dB/m for same in three chemicals at 1 THz. Moreover, effective area, effective mode index and total power fraction in core air holes are also briefly described here. In addition, this proposed circular photonic crystal fiber (RH-CPCF) can be used especially for chemical sensing in biomedical, industrial quality control, material research, micro-optics and many communication applications in THz technology.
关键词： Terahertz sensor,Sensitivity,Optical loss profile,Photonic crystal fiber,Optical sensor,FEM based analysis
更新于2025-09-12 10:27:22
-
[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Chalcogenide Glass Polarization-Maintaining Photonic Crystal Fiber for Mid-Infrared Supercontinuum Generation
摘要： Chalcogenide-glass-based optical fibers are excellent photonic platforms for nonlinear applications in the mid-IR region due to their wide transmission window, tunable dispersion and high optical nonlinearity. There is particular interest in combining the chalcogenide fiber platform with polarization-preserving properties as this will allow polarization-dependent measurements while minimizing detrimental effects and thus enable new applications in interferometric techniques, gas sensing, integrated-optic devices and optical coherence tomography. In this work, for the first time to our knowledge, we demonstrate mid-IR supercontinuum (SC) generation in a highly birefringent polarization maintaining photonic crystal fiber (PM-PCF). The PM-PCF was drawn using the casting method from As38Se62 glass which features a transmission window from 2-10 μm and a high nonlinear refractive index up to 1.13×10-17 m2/W [1,2]. To introduce strong birefringence, an asymmetric arrangement of air holes was used as shown in Fig. 1(a). The PCF cross section consists of 36 circular air holes in 3 rings with 2 larger air holes adjacent to the core. The (approximate) core diameter (i.e. distance between two large air holes) is ~8.1 μm and the outer diameter of the PCF is 125 μm. The group velocity dispersion and group birefringence for the fundamental mode (computed from the SEM image) are shown in Fig. 1(b). The fiber has a zero-dispersion wavelength around 4.5 μm and, at this wavelength, a large birefringence of 6×10-4 such that strong polarization maintaining properties are expected. In our experiments, a 25cm long PM-PCF was pumped with 250 fs pulses at 4 μm (i.e. the normal dispersion regime) using the same experimental setup for MIR SC generation as previously described in Ref. [3]. Figure 1(c) shows the generated SC spectra with different output power. For a pump power of 135 mW, we obtained a SC spectrum from 3.1-6.02 μm with an average output power of 11 mW. Pumping close to the zero dispersion wavelength with the pump at 4.53 μm yielded comparable spectral broadening but at much lower input pump power of 62 mW as shown in Fig. 1(d). In this case, we were able to measure the polarization dependence of the SC spectra by changing the coupling angle through rotation of the fiber. These results demonstrate the potential of chalcogenide PM-PCF for polarized SC generation, and work is underway to optimize the spectral generation and polarization dependency using detailed numerical modelling.
关键词： Polarization-maintaining,Photonic crystal fiber,Chalcogenide glass,Mid-infrared,Supercontinuum generation
更新于2025-09-12 10:27:22