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- 摘要
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[IEEE 2019 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) - Ottawa, ON, Canada (2019.7.8-2019.7.12)] 2019 International Conference on Numerical Simulation of Optoelectronic Devices (NUSOD) - Directed Logic WDM-Based Scalable Optical Decoder Using Micro-Ring Resonators
摘要： A novel design for an optical decoder is demonstrated in which by using the Wavelength-Division Multiplexing (WDM) property of the micro-ring resonators, we greatly simplify the design and achieve scalability to produce N-bit decoders. We designed the decoder logic using directed logic. Directed logic takes the full advantage of integrated photonics and electronics and has received lots of investigation since its introduction. The feasibility of the proposed decoder is verified through simulation.
关键词： optical decoder,Wavelength-Division Multiplexing,scalability,directed logic,micro-ring resonators
更新于2025-09-16 10:30:52
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Vertically Coupled Plasmonic Racetrack Ring Resonator for Biosensor Applications
摘要： Plasmonic chemical and biological sensors offer significant advantages such as really compact sizes and extremely high sensitivity. Biosensors based on plasmonic waveguides and resonators are some of the most attractive candidates for mobile and wearable devices. However, high losses in the metal and complicated schemes for practical implementation make it challenging to find the optimal configuration of a compact plasmon biosensor. Here, we propose a novel plasmonic refractive index sensor based on a metal strip waveguide placed under a waveguide-based racetrack ring resonator made of the same metal. This scheme guarantees effective coupling between the waveguide and resonator and low loss light transmittance through the long-range waveguide. The proposed device can be easily fabricated (e.g., using optical lithography) and integrated with materials like graphene oxide for providing adsorption of the biomolecules on the sensitive part of the optical elements. To analyze the properties of the designed sensing system, we performed numerical simulations along with some analytical estimations. There is one other interesting general feature of this sensing scheme that is worth pointing out before looking at its details. The sensitivity of the considered device can be significantly increased by surrounding the resonator with media of slightly different refractive indices, which allows sensitivity to reach a value of more than 1 μm per refractive index unit.
关键词： biosensors,metal-strip waveguides,plasmonic ring resonators
更新于2025-09-16 10:30:52
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Nonlinear operation of resonant sensors based on weakly-coupled resonators: Experimental investigation of an actively-coupled architecture
摘要： This paper is aimed at the validation of a theoretical analysis of the properties of nonlinearly-operated weakly-coupled resonators (WCRs) for resonant sensing applications. In particular, we investigate the relationships between the operating point of such devices and different performance indicators, such as parametric sensitivity, sensitivity to drive level and to noise, and bandwidth. To this end, a couple of high-Q MEMS resonators exhibiting nonlinear restoring and damping forces are used. A careful characterization of the resonators and their associated electronics is made, resulting in a very good, quantitative fit between the experimental results and those predicted by theory.
关键词： Weakly-coupled resonators,Nonlinear oscillations,Resonant sensors
更新于2025-09-16 10:30:52
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[IEEE 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Guangzhou, China (2019.5.19-2019.5.22)] 2019 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Compact Cross-Coupled Bandpass Filter With Second and Third Harmonic Suppression
摘要： A compact cross-coupled bandpass filter with second and third harmonic suppression is proposed. Quarter-wavelength resonators and 0° feed structure are introduced to suppress second and third spurious responses. The measured return loss and insertion loss of the proposed filter with four quarter-wavelength resonators are better than 17.2 dB and less than 1.85 dB in the range of 3.42 GHz to 3.6 GHz, respectively, and the upper stopband is up to 3.7f0 with an insertion loss larger than 20.1 dB.
关键词： compact cross-coupled bandpass filter,0° feed structure,second and third harmonic suppression,quarter-wavelength resonators
更新于2025-09-16 10:30:52
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Control and calibration recipes for photonic integrated circuits
摘要： This paper presents the key ingredients and the best practices for implementing simple, effective and robust control and calibration procedures for arbitrary photonic integrated circuit (PIC) architectures. Three main features are presented and discussed: a technique to cancel out the effects of mutual crosstalk among thermal tuners, the exploitation of labelling to identify different optical signals, the use of input modulated signal to automatically reshape the frequency response of the device. Examples of application are then illustrated to show the validity and generality of the approach, namely a cross-bar interconnect matrix router, a variable bandwidth filter and third order coupled microring filter. Further, the automatic and dynamic generation of the lookup table of add/drop hitless filters operating on a dense wavelength division multiplexing grid is demonstrated. The lookup table achieved with the proposed approach can dynamically update itself to new conditions of the chip or new requirements of operation, such as variations in channel modulation format or perturbation induced by neighboring devices due to a change in their working point.
关键词： control,optical filters,microring resonators,pilot tones,integrated photonics,calibration,look up tables,thermal cross talk,tuning,locking
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - Atlanta, GA, USA (2019.7.7-2019.7.12)] 2019 IEEE International Symposium on Antennas and Propagation and USNC-URSI Radio Science Meeting - A Substrate Integrated Waveguide Filtering Slot Antenna Array
摘要： A fully integrated 1×4 filtering linear antenna array is presented in this work. The filtering array is designed in substrate integrated waveguide technology and consists of 5 coupled cavities with a 6th-order filtering function. The antenna array is formed with a linear arrangement of four slot antennas in the final cavities which excite two modes in the radiating cavity. The array operates at a center frequency of 6.75 GHz with a fractional bandwidth of 5.0% and with a gain of 7.44 dBi.
关键词： slot antennas,cavity resonators,linear antenna arrays,band pass filters
更新于2025-09-16 10:30:52
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Multiple scattering enabled superdirectivity from a subwavelength ensemble of resonators
摘要： An ensemble of resonators arranged on a subwavelength scale is usually considered as a bulk effective medium, known as a metamaterial, and can offer unusual macroscopic properties. Here, we take a different approach and limit ourselves to the study of only a few number of such elementary components and demonstrate that they still offer uncommon opportunities. Typically, owing to the multiple scattering and the phase shift that the resonances offer, we observe ?elds that vary at scales completely independent of the wavelength in free space. By smartly tuning the resonance frequencies, we can design at will the complex current distribution in those resonators. This way, we design a superdirective antenna, i.e., an antenna that is surprisingly more directive than its size would foreshadow. This approach is veri?ed numerically and experimentally in the context of microwaves, but this applies to any wave ?eld where subwavelength resonators exist.
关键词： metamaterials,superdirectivity,microwaves,subwavelength resonators,multiple scattering
更新于2025-09-16 10:30:52
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A Multipurpose and Highly-Compact Plasmonic Filter based on Metal-Insulator-Metal Waveguides
摘要： A multipurpose and ultra-compact nanoplasmonic wavelength filter based on stub structure in a metal-insulator-metal (MIM) waveguide is suggested and numerically investigated. A novel approach of connecting two stepped-like apertures to both input and output ports is applied to form Fabry-Perot (FP) cavities, which enabled the structure to act as a dual band-pass filter at wavelengths 1310 nm and 1550 nm. It is shown that the variation in cavities’ length allows to realize a long-wavelength cutoff filter, and cutoff wavelength can be easily tuned by adjusting the length of the cavities. Furthermore, it is revealed that increasing the gap between the stepped-like apertures and the cavities provides a triple band-pass at telecom wavelengths, e.g. 1267.5nm, 1414.19 nm, and 1644.7 nm. The tunable broadband high-pass wavelength filter is then achieved while the lengths of stepped-like apertures and stub resonators are set to be identical. Finally, a tunable nearly perfect absorber can be obtained by varying the width of stub resonators. Therefore, because of functionality, size, as well as efficiency the proposed plasmonic filter may greatly contribute to miniaturization of next generation of photonic integrated circuits (PICs), and find applications in on-chip integration and wavelength-division multiplexing (WDM) in optical communication systems.
关键词： wavelength filtering devices,optical filters,Coupled resonators,photonic integrated circuits,surface plasmon polaritons,Fabry-Perot
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Chicago, IL, USA (2019.6.16-2019.6.21)] 2019 IEEE 46th Photovoltaic Specialists Conference (PVSC) - Device model for intermediate band materials
摘要： Gallium nitride (GaN) is a wide bandgap semiconductor material and is the most popular material after silicon in the semiconductor industry. The prime movers behind this trend are LEDs, microwave, and more recently, power electronics. New areas of research also include spintronics and nanoribbon transistors, which leverage some of the unique properties of GaN. GaN has electron mobility comparable with silicon, but with a bandgap that is three times larger, making it an excellent candidate for high-power applications and high-temperature operation. The ability to form thin-AlGaN/GaN heterostructures, which exhibit the 2-D electron gas phenomenon leads to high-electron mobility transistors, which exhibit high Johnson’s figure of merit. Another interesting direction for GaN research, which is largely unexplored, is GaN-based micromechanical devices or GaN microelectromechanical systems (MEMS). To fully unlock the potential of GaN and realize new advanced all-GaN integrated circuits, it is essential to cointegrate passive devices (such as resonators and filters), sensors (such as temperature and gas sensors), and other more than Moore functional devices with GaN active electronics. Therefore, there is a growing interest in the use of GaN as a mechanical material. This paper reviews the electromechanical, thermal, acoustic, and piezoelectric properties of GaN, and describes the working principle of some of the reported high-performance GaN-based microelectromechanical components. It also provides an outlook for possible research directions in GaN MEMS.
关键词： wide bandgap,resonators,HEMT,micromachining,III-V,microelectromechanical systems,piezoelectric materials
更新于2025-09-16 10:30:52
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Rotation sensing in two coupled whispering-gallery-mode resonators with loss and gain
摘要： We theoretically propose a scheme to realize rotation sensing based on two coupled whispering-gallery-mode resonators with loss and gain. We consider that the active resonator with gain is rotated while the passive one with loss is stationary. The rotation will induce Sagnac effect and we show that the eigenfrequencies of the supermodes are sensitive to the Sagnac-Fizeau shift. Therefore, we can measure the average photon number in the steady state or the ?uctuation spectrum of the output ?elds to detect the angular velocity of the rotation. We hope that our investigation will be useful in the design of a quantum gyroscope based on spinning resonators.
关键词： whispering-gallery-mode resonators,Sagnac effect,rotation sensing,loss and gain,quantum gyroscope
更新于2025-09-16 10:30:52