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High Sensitivity SSR Based Sensor Used for Permittivity Measurement
No full textThe proposed compact sensor is based on a Split Square Resonator (SRR) to improve the detection. The dimensions of the SRR have been chosen to provide a mutual coupling with a high sensitivity. The material under test (MUT) is placed in the near-field region of the sensor. The design exhibits a high sensitivity of 58% as the relative permittivity of MUT’s changes from 1 to 10. the proposed sensor can also measure the permeability and losse
An Asynchronous Co-Simulation Method for Time-Dependent Simulations: Application to a Transmission Line Network
No full textNumerical co-simulation methods are increasingly used to solve complex electromagnetic compatibility problems. For the time-dependent Maxwell-Equations, these approaches may exchange information and simulation results for each temporal iteration. In this paper, we propose an asynchronous temporal co-simulation method. The approach is illustrated on a transmission lines network. The results obtained are validated with the global simulation
Heterogenously integrated Gallium phosphide optomechanical oscillator on Soi waveguides
No full textWe present a one dimensional photonic crystal, made of GaP, as an optomechanical oscillator with low phase noise heterogenously integrated on Silicon-on-Insulator circuitry. The mechanical oscillation at 3.35 GHz is directly imprinted on the optical carrier. An external opto  electronic feedback loop with time-delay is constructed to further stabilize the oscillation. We achieved a phase noise of -111dBc/Hz at 100 kHz offset frequency with sub-Hz linewidth of 0.67 Hz
Polarization Reconfigurable Patch Antenna with Ground Slots for Sub-6GHz Applications
No full textA polarization reconfigurable patch antenna truncated at the corners has been presented in this paper. The proposed antenna is covering the sub-6GHz band (4.8-5GHz). In order to achieve reconfigurability, D-shaped slots have been cut in the ground plane and PIN diodes are inserted in each slot. The antenna is capable of switching between two polarization states i.e. linear polarization and circular polarization. Moreover, 3D radiation pattern of the design is also shown in order to check the pattern stability
Nonlinear Nanomechanical Photonic Metamaterials
No full textBy harnessing mechanical and optical resonances in tandem one can enhance the magnitude of actuation and optical response in dynamically reconfigurable nanostructures driven by microwatt optical signals and low-intensity acoustic vibrations. We review recent work on structures exhibiting profound opto-mechanical nonlinearity and bistability
Electromagnetic modelling of Leaf Water Potential under Ultra-Wide Band Microwaves Sensing
No full textNoninvasive sensor of plant that measure leaf concentration water is purposed. It is based on a microstrip structure where the loaded layer is represented by a mathematical model. The leaf is represented with the cellulose Cole-Debye model, that includes freshwater molecules which are simulated with different size to characterize the turgescence and plasmolysis behavior. The concept is validated and compared to Cole-Debye model for different situation of stress leaf, represented by an equivalent dielectric cell over the sensor
Controlling the PT Symmetry of Non-Hermitian Graphene Dirac Plasmons and its Application to Terahertz Lasers
No full textWe present new ideas on the operating principle and device structure of graphene plasmonic laser transistors based on controlling the PT symmetry of graphene Dirac plasmons with high radiation intensity and ultrafast modulation capability operating at room temperature in the THz frequency band
Gain and Efficiency Enhancement of mm-Wave On-Chip Antennas Through Artificial Magnetic Conductors
No full textThis talk describes AMC design steps in an on-chip environment and shows how it can be used to boost AoC radiation performance. Further, it also shows innovative techniques for AMC thickness reduction to make it more suitable with the traditional CMOS stack-ups
Floquet Topological Electromagnetics
No full textIn this paper, we unveil a new route to photonic Floquet TIs, based on quasi-electrostatic wave propagation in switched capacitor networks. This approach enables the first experimental demonstration of a non-reciprocal Floquet TI for electromagnetic waves, additionally offering an ultra-broad topological bandgap, spanning from DC up to GHz frequencies, within a deeply sub-wavelength form factor in a chip-scale integrated CMOS implementation
Backward Terahertz-wave parametric oscillator and its application in nondestructive testing
No full textWe demonstrated backward terahertz-wave parametric oscillation and generated terahertz-wave pulses with a high peak intensity of about 200 W at 0.3 THz. And Terahertz-wave imaging was performed using the source for nondestructive testing applications. Due to the long-time stability of terahertz-wave oscillation, transmission images with good visibility and inside information were obtained by point scanning imaging. As a result of measuring various materials, we found that the system is applicable to versatile nondestructive inspection applications