Miguel Rodríguez

University of Utah

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Jennifer S. Shumaker‐Parry

University of Utah

Steve Blair

University of Utah

Jean‐Pierre Wolf

University of Geneva

Riad Bourayou

Deutsches Herzzentrum der Charité

Jérôme Kasparian

University of Geneva

R. Sauerbrey

Helmholtz-Zentrum Dresden-Rossendorf

G. Méjean

Laboratoire Interdisciplinaire de Physique

L. Wöste

Freie Universität Berlin

Jin Yu

Shanghai Jiao Tong University

Estelle Salmon

Centre National de la Recherche Scientifique

Cooperative Institutions

University of Utah

Centre National de la Recherche Scientifique

SUNY Polytechnic Institute

Université Claude Bernard Lyon 1

Universidad de Oviedo

Laboratoire de Spectrométrie Ionique et Moléculaire

University at Albany, State University of New York

Albany State University

University of Freiburg

Thüringer Landessternwarte Tautenburg

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Elements For A Sustainable Lunar Colony In The South Polar Region (AAS 03-767)

Khaled Al-Jammaz A. Calzada Diaz F. Hernández Sreemathi Iyer Carlos A. Ortiz

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Scaling the Response of Nanocrescent Antennas into the Ultraviolet

ACS Photonics (2014)

Miguel Rodríguez Cynthia Furse Jennifer S. Shumaker‐Parry Steve Blair

Fundamental resonance modes of nanocrescent optical antennas are associated with large electric fields at the crescent tips. These antennas have been extensively studied due to their relative ease of fabrication and tunable response via methods such as nanosphere template lithography. To date, investigations have only been performed in the visible to mid-infrared range, where the multimode anisotropic response has been documented both experimentally and through simulations. However, the presence of interband transitions in the dielectric response of the metals used for these studies complicates the analysis of the higher-order resonance modes. In this paper, we perform a comprehensive investigation of the electromagnetic response of aluminum nanocrescent antennas. Aluminum has an interband transition in the near-infrared that facilitates scaling of the resonance modes into the ultraviolet part of the spectrum, thus, allowing investigation of the higher-order modes of the nanocrescent structure. These higher-order modes exhibit intense and controllable hot spots, suggesting that nanocrescent antennas are suited for applications in the UV regime.

Ultraviolet

Nanosphere lithography

10.1021/ph400151n

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Citations (22)

La radio en España

Fundesco: Boletín de la Fundación para el Desarrollo de la Función Social de las Comunicaciones (1996)

Miguel Rodríguez

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Femtosecond White-Light LIDAR for Simultaneous Cloud Particle Sizing and Relative Humidity Measurements

ESASP (2004)

G. Méjean Riad Bourayou Jérôme Kasparian Miguel Rodríguez Estelle Salmon

We use a femtosecond white-light lidar for an extended characterisation of the cloud microphysics. We deduce Particle size and density within the cloud from the multispectral multiple scattering pattern of an ultrashort terawatt laser on a cloud. Furthermore we yield temperature and relative humidity from the spectral analysis of the atmospheric transmission of the whitelight continuum from the same laser source which permits to make simultaneous measurements.

Particle (ecology)

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Native fluorescence enhancement using an Aluminum bowtie nano-antenna

Xueling Cheng Miguel Rodríguez Yunshan Wang

Ultraviolet (UV) plasmonic nanostructures hold promises in enabling label-free sensing of biomolecules using their native fluorescence. Several UV plasmonic structures have been explored to enhance native fluorescence of biomolecules, including metallic thin film, particle array, hole array using aluminum, magnesium, indium, etc. However, the enhancement factor of them is quite small, with less than 80 times for nucleic acids and less than 15 times for amino acids. In order to achieve higher enhancement factor, we study a bowtie nano-antenna (BNA) made of aluminum (Al) in the ultraviolet region. The effect of the native oxide layer on Al is also investigated. The numerical simulation has shown 1026x net enhancement with the optimal geometry.

Biomolecule

Ultraviolet

10.1117/12.2568826

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In operando investigation of GaN PIN device characteristics under electron irradiation energies comparable to Pm-147 source for betavoltaic application

AIP Advances (2020)

Kasey Hogan Miguel Rodríguez Emma Rocco Vincent Meyers Benjamin McEwen

Here, we report on the application of an electron source with high accelerating voltage (62 kV–200 kV) to simulate betavoltaic power generation capabilities of a planar GaN PIN (p-GaN/i-GaN/n-GaN) device. The in situ electrical characterization reported here enables detailed performance comparison of new device designs to conventional device configurations. In operando investigation of a GaN PIN device under irradiation by a modified transmission electron microscope is being reported here. A large-area planar GaN PIN (0.04 cm2, 17.8 nA/cm2 at 5 V reverse bias) device was irradiated with an electron beam of approximately equivalent spot size. At an approximate input current density of 5 nA/cm2, the maximum power produced (MPP) decreases from 2.45 µW/cm2 to 0.45 µW/cm2 with an increase in the beam voltage from 62 kV to 200 kV. This reduction in power corresponds to reduced electron–hole pair generation and capture within the active region of the device. The inverse relation of MPP to beam voltage is modeled by CASINO2 Monte Carlo simulations of energy absorption and is found to be in good agreement with the experimental measurement. At a constant 62 kV beam voltage, MPP is shown to increase with beam current density up to 48.2 µW/cm2 at 177 nA/cm2. Repeated device dark current measurements following the irradiation indicate no degradation of the device. An irradiation dose of ∼1016 cm−2, equivalent to exposure from a 10 mCi radioisotope source for 1 yr, was performed at an energy of 200 kV, with no appreciable deterioration in device performance.

Electron beam processing

Acceleration voltage

Wide-bandgap semiconductor

10.1063/5.0015517

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Polarization Anisotropy of Multiple Localized Plasmon Resonance Modes in Noble Metal Nanocrescents

The Journal of Physical Chemistry C (2013)

Cindy T. Cooper Miguel Rodríguez Steve Blair Jennifer S. Shumaker‐Parry

Multiple localized surface plasmon resonance (LSPR) modes induced in gold and silver nanocrescents exhibit anisotropic behavior with respect to polarization of incident light. Extinction spectroscopy with polarization control was used to characterize the optical properties of asymmetric nanocrescents with diameters ranging from 100 to 500 nm. The analysis shows that selective induction of distinct dipole and quadrupole LSPR modes can be accomplished through polarization of incident light. Finite-difference time-domain calculations of the LSPR responses of the nanocrescent corroborate the polarization-dependent optical behavior. Simulations reveal optical near field enhancements with unique spatial patterns associated with the individual resonance modes depending on the polarization and wavelength of incident light. Quantitative analysis of the anisotropic LSPR behavior supports the potential for controlling the near field through selective induction of specific resonance modes with particular near field distributions.

Ray

Localized surface plasmon

10.1021/jp4107876

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Citations (44)

Kilometer-range nonlinear propagation of femtosecond laser pulses

Physical Review E (2004)

Miguel Rodríguez Riad Bourayou G. Méjean Jérôme Kasparian Jin Yu

Ultrashort, high-power laser pulses propagating vertically in the atmosphere have been observed over more than 20 km using an imaging 2-m astronomical telescope. This direct observation in several wavelength bands shows indications for filament formation at distances as far as 2 km in the atmosphere. Moreover, the beam divergence at 5 km altitude is smaller than expected, bearing evidence for whole-beam parallelization about the nonlinear focus. We discuss implications for white-light Lidar applications.

Beam divergence

10.1103/physreve.69.036607

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Citations (292)

A Novel Adaptive Synchronous Rectification System for Low Output Voltage Isolated Converters

IEEE Transactions on Industrial Electronics (2010)

Miguel Rodríguez Diego G. Lamar Manuel Arias Roberto Prieto J. Sebastián

The design of efficient isolated low output voltage converters is a major concern due to their widespread use. One of the preferred methods used to maximize their efficiency is synchronous rectification (SR), i.e., the replacement of the secondary side diodes with MOSFETs to decrease conduction losses. However, depending on the topology being used, SR might not provide the required efficiency improvement or even be easily implemented. This paper presents a novel SR system that can be applied to converters with symmetrically driven transformers and to converters from the flyback family; in both cases, the proposed system adaptively generates a control signal that controls a synchronous rectifier MOSFET placed in parallel with each diode, turning it on during the conduction intervals of the diodes. The proposed system uses only information from the secondary side, thus avoiding breaking the isolation barrier; it can be built using a few low-cost analog components, is reliable and simple, and could be easily implemented in an integrated circuit. Up to a 3% improvement is demonstrated in a 3.3–5-V 120-W push–pull converter, and up to a 2.5% improvement is obtained in a 5-V 50-W flyback converter, with both of them designed for telecom applications.

10.1109/tie.2010.2089944

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Trigger unit for systems that use diode lasers mounted on a closed-cycle refrigerator

Review of Scientific Instruments (1992)

Miguel Rodríguez Ramón A.B. Álvarez

Impact shocks produced by the closed-cycle refrigerator produce jitter in the output frequency of a diode laser. An electronic device is described which allows triggering of the data acquisition system when the influence of the vibration-induced noise is at a minimum.

10.1063/1.1143259

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