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13 results on '"Hilario, Martin S."'

1. A reflective mm-wave photonic limiter

Author

Kononchuk, Rodion, Suwunnarat, Suwun, Hilario, Martin S., Baros, Anthony E., Hoff, Brad W., Vasilyev, Vladimir, Vitebskiy, Ilya, Kottos, Tsampikos, and Chabanov, Andrey A.

Subjects
Physics - Applied Physics, Physics - Optics
Abstract

Millimeter wave (mm-wave) communications and radar receivers capable of processing small signals must be protected from high-power signals, which can damage sensitive receiver components. Many of these systems arguably can be protected by using photonic limiting techniques, in addition to electronic limiting circuits in receiver front-ends. Here we demonstrate, experimentally and numerically, a free-space, reflective mm-wave limiter based on a multilayer structure involving a nanolayer of vanadium dioxide (VO2), experiencing a thermal insulator-to-metal transition. The multilayer acts as a variable reflector, controlled by the input power. At low input power levels, VO2 remains dielectric, and the multilayer exhibits resonant transmittance. When the input power exceeds a threshold level, the emerging metallic phase renders the multilayer highly reflective while dissipating a small portion of the input power without damage to the limiter. In the case of a Gaussian beam, the limiter has a nearly constant output above the limiting threshold input., Comment: 18 pages, 6 figures, 3 supplementary figures and 1 supplementary table

Published
2020
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2. High-K dielectric sulfur-selenium alloys.

Author

Susarla, Sandhya, Tsafack, Thierry, Owuor, Peter Samora, Puthirath, Anand B, Hachtel, Jordan A, Babu, Ganguli, Apte, Amey, Jawdat, BenMaan I, Hilario, Martin S, Lerma, Albert, Calderon, Hector A, Robles Hernandez, Francisco C, Tam, David W, Li, Tong, Lupini, Andrew R, Idrobo, Juan Carlos, Lou, Jun, Wei, Bingqing, Dai, Pengcheng, Tiwary, Chandra Sekhar, and Ajayan, Pulickel M

Abstract

Upcoming advancements in flexible technology require mechanically compliant dielectric materials. Current dielectrics have either high dielectric constant, K (e.g., metal oxides) or good flexibility (e.g., polymers). Here, we achieve a golden mean of these properties and obtain a lightweight, viscoelastic, high-K dielectric material by combining two nonpolar, brittle constituents, namely, sulfur (S) and selenium (Se). This S-Se alloy retains polymer-like mechanical flexibility along with a dielectric strength (40 kV/mm) and a high dielectric constant (K = 74 at 1 MHz) similar to those of established metal oxides. Our theoretical model suggests that the principal reason is the strong dipole moment generated due to the unique structural orientation between S and Se atoms. The S-Se alloys can bridge the chasm between mechanically soft and high-K dielectric materials toward several flexible device applications.

Published
2019

3. Computational Characterization of a Composite Ceramic Block for a Millimeter Wave Heat Exchanger

Author

Kumi, Petra, Venne, Jonathan S., Yakovlev, Vadim V., Hilario, Martin S., Hoff, Brad W., Rittersdorf, Ian M., Bock, Hans Georg, Series Editor, de Hoog, Frank, Series Editor, Friedman, Avner, Series Editor, Gupta, Arvind, Series Editor, Nachbin, André, Series Editor, Ozawa, Tohru, Series Editor, Pulleyblank, William R., Series Editor, Rusten, Torgeir, Series Editor, Santosa, Fadil, Series Editor, Seo, Jin Keun, Series Editor, Tornberg, Anna-Karin, Series Editor, Nicosia, Giuseppe, editor, and Romano, Vittorio, editor

Published
2020
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8. A reflective millimeter-wave photonic limiter

Author

Kononchuk, Rodion, primary, Suwunnarat, Suwun, additional, Hilario, Martin S., additional, Baros, Anthony E., additional, Hoff, Brad W., additional, Vasilyev, Vladimir, additional, Vitebskiy, Ilya, additional, Kottos, Tsampikos, additional, and Chabanov, Andrey A., additional

Published
2022
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12. Comparison of Electrostatic Fins with Piezoelectric Impact Hammer Techniques to Extend Impulse Calibration Range of a Torsional Thrust Stand (Preprint)

Author

ENGINEERING RESEARCH AND CONSULTING INC (ERC INC) EDWARDS AFB CA, Pancotti, Anthony P., Hilario, Martin S., Gilpin, Matthew, ENGINEERING RESEARCH AND CONSULTING INC (ERC INC) EDWARDS AFB CA, Pancotti, Anthony P., Hilario, Martin S., and Gilpin, Matthew

Abstract

With growing interest and development of large pulsed plasma electric propulsion devices, it has become necessary to accurately measure their thruster performance. Direct thrust measurements are the best way to measure the impulse of a propulsion device which requires it to be mounted entirely on the thrust stand. In many cases this means the thrust stand must support 10 to 100's of kilograms and still be able to resolve mNs worth of impulse. With the development of this new class of thrust stand, an accurate and repeatable method of calibration is needed. Two such calibration methods have been examined and compared. Electrostatic fin (ESF) and piezoelectric impact hammer (PIH) calibration systems were simultaneously tested on a large scale torsional thrust stand system. The use of these two methods allowed the stand to be calibrated over four orders of magnitude, from 0.01mNs to 750mNs. The ESF system produced linear results within 0.52% from 0.01mNs to 12mNs, while the PIH system extended this calibration range from 1mNs to 750mNs with an error of 0.99%. These two calibration methods also agreed within 4.51% over their overlapping range of 10 to 20 mNs., Prepared in collaboration with Univ. of Southern California. For publication in American Institute of Physics: Review of Scientific Instruments: Apr 2011

Published
2011

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