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Photonic crystal spatial filtering in broad aperture diode laser
摘要： Broad aperture semiconductor lasers usually suffer from low spatial quality of the emitted beams. Due to the highly compact character of such lasers, the use of conventional intracavity spatial ?lters is problematic. We demonstrate that extremely compact photonic crystal spatial ?lters, incorporated into a laser resonator, can improve the beam spatial quality and, correspondingly, increase the brightness of the emitted radiation. We report the decrease in the M2 value from 47 down to 28 due to photonic crystal spatial intracavity ?ltering and the increase in the brightness by a factor of 1.5, giving a proof of principle of intracavity photonic crystal spatial ?ltering in broad area semiconductor lasers.
关键词： photonic crystal,spatial filtering,beam quality,broad aperture diode laser,brightness
更新于2025-09-16 10:30:52
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Electromagnetic Property of Coupled System of One-Dimensional Photonic Crystal
摘要： We propose and validate a novel coupled system of photonic crystals with four ports. The electromagnetically coupled waveguide system of microstrip lines with four ports is con?gured with a pair of closely aligned one-dimensional photonic crystals. The transmission characteristics between two ports are calculated by the method of moments and are observed by using a vector network analyzer. The special transmission characteristics of the coupled transmission line and the photonic crystal are observed. Outside the photonic band gap region, the transmission characteristics from the incident port on a transmission line to the exit port on the other line show re?ection characteristics that are unique to the photonic crystal. This is because only the odd modes are coupled between two closely aligned transmission lines. Inside the photonic band gap region, the transmission spectra become opaque because of the absence of electromagnetic modes.
关键词： photonic crystal,microstrip lines,electromagnetic modes,coupled system,transmission characteristics
更新于2025-09-16 10:30:52
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[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
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[IEEE 2019 IEEE International Meeting for Future of Electron Devices, Kansai (IMFEDK) - Kyoto, Japan (2019.11.14-2019.11.15)] 2019 IEEE International Meeting for Future of Electron Devices, Kansai (IMFEDK) - Invited: Polymer Light-Emitting Devices with Selectively Transparent Photonic Crystals Consisting of Printed Inorganic/Organic Hybrid Dielectric Films
摘要： Selectively transparent photonic crystals consisting of printed inorganic/organic hybrid dielectric films based on inorganic copper(I) thiocyanate can be produced to exhibit intense Bragg peaks over their stop band in the visible region. This work exhibits a unique approach to achieve the improvement of color purity and the strong directed emission pattern for polymer light-emitting diodes and AC-driven electroluminescent devices with printed inorganic/organic hybrid dielectric mirrors, which will be important for all-printed microlight sources.
关键词： photonic crystal,dielectric film,distributed Bragg reflector,inorganic/organic hybrid film,polymer light-emitting device,solution process
更新于2025-09-16 10:30:52
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Enhancement of thermal and electro-optical properties of photonic crystal fibers infiltrated with a modified 6CHBT nematic liquid crystal doped with gold nanoparticles
摘要： In this paper we present the obtained experimental results for enhancing the parameters of photonic crystal fibers infiltrated with a modified 6CHBT doped with gold nanoparticles. By admixing a special liquid crystalline material we were able to widen the working temperature range of our samples. Doping our liquid crystal mixture with nanoparticles visibly enhances the thermal and electro-optical properties of the infiltrated photonic crystal fibers. Additionally, the use of a specially designed four microelectrode system allowed to decrease voltage. Thanks to the introduced modifications we noticed a significant reduction of threshold voltages (up to 44%), rise times (up to 30%) and fall times (up to 50%).
关键词： Photonic crystal fibers,Nanoparticles,Liquid crystals
更新于2025-09-16 10:30:52
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Reflective arrayed waveguide grating with parallel arms using one-dimensional photonic crystal reflector
摘要： The authors demonstrate reflective arrayed waveguide grating designed for silicon waveguide. The phase shift sections of the arrayed waveguide are placed in parallel configuration. This enables the construction of compact device. The one-dimensional photonic crystal is used as the reflector at the end of the arm. Wide reflection bandwidth is obtained.
关键词： silicon waveguide,compact device,one-dimensional photonic crystal,wavelength division multiplexing,reflective arrayed waveguide grating
更新于2025-09-16 10:30:52
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Angular Dependence of Photonic Crystal Coupled to Photovoltaic Solar Cell
摘要： Photonic crystals have the advantage of minimizing thermal losses from solar cells, reflecting the solar radiation that is not absorbed by the photovoltaic device. To optimize this optical response, photonic crystals are designed considering the relative position of the Bragg peak and the bandgap of the solar cell, under normal incident irradiation conditions. The aim of this research article was to determine experimentally the optical limits of a solar cell coupled to a photonic crystal acting as beam splitter. For that purpose, the photovoltaic system was characterized under indoor and outdoor conditions; angular dependence of the irradiation source was determined in each case, and both results were compared with good agreement. Moreover, other parameters such as irradiation spectrum and polarization of the light were investigated. The main conclusion is that photovoltaic performance is highly affected by the Bragg peak shifting and the profile is distorted, due to the angular dependence with the sun. These experimental limits must be considered at the early design stage to avoid performance losses.
关键词： spectral radiation,solar energy,photovoltaic,photonic crystal,beam splitter,polarization
更新于2025-09-16 10:30:52
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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
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Universal numerical calculation method for the Berry curvature and Chern numbers of typical topological photonic crystals
摘要： Chern number is one of the most important criteria by which the existence of a topological photonic state among various photonic crystals can be judged; however, few reports have presented a universal numerical calculation method to directly calculate the Chern numbers of different topological photonic crystals and have denoted the in?uence of different structural parameters. Herein, we demonstrate a direct and universal method based on the ?nite element method to calculate the Chern number of the topological photonic crystals by dividing the typical Brillouin zone into small zones, establishing new properties to obtain the discrete Chern number, and simultaneously drawing the Berry curvature of the ?rst Brillouin zone. We also explore the manner in which the topological properties are in?uenced by the different structure types, air duty ratios, and rotating operations of the unit cells; meanwhile, we obtain large Chern numbers from – 2 to 4. Furthermore, we can tune the topological phase change via different rotation operations of triangular dielectric pillars. This study provides a highly ef?cient and simple method for calculating the Chern numbers and plays a major role in the prediction of novel topological photonic states.
关键词： Chern number,?nite element method,symmetry,topological photonic crystal
更新于2025-09-16 10:30:52
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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