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Start Over Search Limiters Peer Reviewed Topic fields, waves and electromagnetics Topic law.invention
3 results

1. Modeling, fabrication and high power optical characterization of plasmonic waveguides

Author

Oleg Lysenko and Andrei V. Lavrinenko

Subjects
optical characterization, film thickness, Power, Energy and Industry Applications, thin gold films, Optical fiber, metallic thin films, Nanophotonics, Physics::Optics, Optical device fabrication, optical fabrication, optical waveguides, AuSiO2(role ss), law.invention, law, optical losses, Polariton, nanostructured materials, Si(role sur), linear propagation, silicon dioxide, SiO2(role sur), surface plasmon polaritons, Surface plasmon, Components, Circuits, Devices and Systems, O2(role ss), Surface waves, Engineered Materials, Dielectrics and Plasmas, Wavelength, SiO2(role ss), effective index method, nanophotonics, Optoelectronics, silicon compounds, Fields, Waves and Electromagnetics, propagation losses, wavelength 7.5E-07 1.7E-06 m, polaritons, Materials science, Fabrication, Au(role ss), Au(role sur), Bioengineering, plasmonics, Optics, O(role sur), Optical fibers, quality inspection, Si(role ss), high-power laser, Plasmon, AuSiO2(role sur), coupling losses, business.industry, surface plasmons, plasmonic waveguides, gold, wavelength 750 nm to 1700 nm, Surface plasmon polariton, Optical surface waves, propagation vector, Signal Processing and Analysis, Au-SiO2, O(role ss), business, plasmons, O2(role sur)
Abstract

This paper describes modeling, fabrication and high power optical characterization of thin gold films embedded in silicon dioxide. The propagation vector of surface plasmon polaritons has been calculated by the effective index method for the wavelength range of 750-1700 nm and film thickness of 15, 30 and 45 nm. The fabrication process of such plasmonic waveguides with width in the range of 1-100 μm and their quality inspection are described. The results of optical characterization of plasmonic waveguides using a high power laser with the peak power wavelength 1064 nm show significant deviation from the linear propagation regime of surface plasmon polaritons at the average input power of 100 mW and above. Possible reasons for this deviation are heating of the waveguides and subsequent changes in the coupling and propagation losses.

Published
2015

2. Analysis and design of complex impedance transforming marchand baluns

Author

Rasmus S. Michaelsen, Tom K. Johansen, and Kjeld M. Tamborg

Subjects
Engineering, Reactance, Impedance matching, Phase (waves), Capacitors, law.invention, Mathematical model, Balun, law, Microwave theory and techniques, Insertion loss, Electrical impedance, Monolithic microwave integrated circuit, Aerospace, Ports (Computers), Photonics and Electrooptics, business.industry, Electrical engineering, Impedance, Components, Circuits, Devices and Systems, Communication, Networking and Broadcast Technologies, Complex impedance transformation, Capacitor, Signal Processing and Analysis, Integrated circuit modeling, MMIC, business, Fields, Waves and Electromagnetics, Marchand balun
Abstract

A new type of Marchand balun is presented in this paper, which has the property of complex impedance transformation. To allow the Marchand balun to transform between arbitrary complex impedances, three reactances should be added to the circuit. A detailed analysis of the circuit gives the governing equations. To verify the theory, a design and electromagnetic simulation of a lumped element Marchand balun is made in a SiGe BiCMOS technology. The lumped element impementation is favorable because capacitors are placed where the additional reactances should be added. Thus it is possible to absorb a positive reactance by reducing a capacitor. At the design frequency of 10.5 GHz it matches 50Ω to 50 - j66Ω. It has an insertion loss of 5.1 dB, an input reflection of −20.8 dB, as well as phase and magnitude imbalance better than 0.2° and 0.12 dB, respectively.

Published
2014

3. A 24 GHz integrated SiGe BiCMOS vital signs detection radar front-end

Author

Vitaliy Zhurbenko, Tom K. Johansen, and Brian Sveistrup Jensen

Subjects
Transceivers, Engineering, Radar, business.industry, Photonics and Electrooptics, Transmitter, Electrical engineering, Integrated circuits, Integrated circuit, BiCMOS, Chip, law.invention, Mixers, law, Reiceivers, Return loss, Heterodyne detection, Transceiver, Gain, business, Fields, Waves and Electromagnetics, Power generation
Abstract

In this paper a 24 GHz integrated front-end transceiver for vital signs detection (VSD) radars is described. The heterodyne radar transceiver integrates LO buffering and quadrature splitting circuits, up- and down-conversion SSB mixers and two cascaded receiver LNA's. The chip has been manufactured in a 0.25 µm SiGe:C BiCMOS technology and its size is 1390 × 2690 µm2. The transmitter demonstrates a maximum output power at 24 GHz of approximately −30 dBm with an externally applied LO power of 3 dBm. The receiver demonstrates a peak gain of 13.3 dB at 22.15 GHz with >10 dB return loss. The power consumption of the entire transceiver is approximately 164 mW.

Published
2013