A5091518719- Superconducting and THz Device Technology
- Radio Astronomy Observations and Technology
- Stellar, planetary, and galactic studies
- Photonic and Optical Devices
- Calibration and Measurement Techniques
- Astro and Planetary Science
- Adaptive optics and wavefront sensing
- Statistical Mechanics and Entropy
- Thermal Radiation and Cooling Technologies
- Physics of Superconductivity and Magnetism
- Radio Frequency Integrated Circuit Design
- Microwave Engineering and Waveguides
- Spacecraft and Cryogenic Technologies
- Quantum Mechanics and Applications
- Terahertz technology and applications
- Complex Systems and Time Series Analysis
- Planetary Science and Exploration
- Advanced Semiconductor Detectors and Materials
- Astrophysics and Star Formation Studies
- Quantum Information and Cryptography
- Semiconductor Quantum Structures and Devices
- Particle Detector Development and Performance
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Advanced Fiber Optic Sensors
University of Pittsburgh
2025
Dublin Institute For Advanced Studies
2018-2024
National University of Ireland, Maynooth
2013-2024
Trinity College Dublin
2020
University College Dublin
2018
Herein, spatial tailoring of microstructure, magnetic, and mechanical properties in high‐frequency Ni–Zn ferrite toroidal core over cm‐length scales via an efficient microwave (MW) processing technique is successfully achieved. Depending on gradient conditions, one region a sample (R1) more efficiently being heated than the other (R2) due to variation losses. The controlled grain sizes ( D ), saturation magnetization M S microhardness traverses from 0.42 2.25 μm, 28 76 emu g −1 , 84 162 HV,...
Abstract Microwave Kinetic Inductance Detectors (MKIDs) are photon detectors comprised of superconducting LC resonators with unique resonant frequencies corresponding to their geometrical structure. As each pixel has its own geometry, electromagnetic simulations by hand every in a kilo-pixel array impractical. Simulating fewer pixels and interpolating between risks reduced yield arrays due overlapping frequencies. We introduce new software called AEM (Automated Electromagnetic MKID...
Astronomical observations in the far-infrared are critical for investigation of cosmic microwave background (CMB) radiation and formation evolution planets, stars galaxies. In case space telescope receivers, a strong heritage exists corrugated horn antenna feeds to couple signals detectors mounted waveguide or cavity structure. Such have been utilized, example, Planck satellite both single-mode channels observation CMB multi-mode optimized detection foreground sources. Looking demands future...
The progress and results of the ongoing FP7-FISICA programme to re-asses scientific goals a Far-Infrared Space Interfereometer push development some its key technology elements are reported.
The next generation of space missions targeting far-infrared wavelengths will require large-format arrays extremely sensitive detectors. development Transition Edge Sensor (TES) array technology is being developed for future Far-Infrared (FIR) applications such as the SAFARI instrument SPICA where low-noise and high sensitivity required to achieve ambitious science goals. In this paper we describe a modal analysis multi-moded horn antennas feeding integrating cavities housing TES detectors...
New developments in waveguide mode matching techniques are considered, particular the efficient modeling of cavity coupled detectors. This approach is useful far-infrared astronomical instrumentation and cosmic microwave background experiments which bolometers feeding horn antennas or Winston cones often employed for high sensitivity, good control stray light well behaved beam patterns. While such systems can, theory, be modeled using full wave FEM it would desirable, especially large...
Many important astrophysical processes occur at wavelengths that fall within the far-infrared band of EM spectrum, and over distance scales require sub-arc second spatial resolution. It is clear in order to achieve resolution these relatively long (compared optical/near-IR), which are strongly absorbed by atmosphere, a space-based far-IR interferometer will be required. We present analysis optical system for proposed spatial-spectral interferometer, discussing challenges arise when designing...
Astronomy at far-infrared (far-IR) wavelengths is essential to our understanding of the evolution cosmos. However, an absence high angular resolution observations in far-IR, from roughly 30-300 µm) inhibits ability address important science questions, and due opacity Earth's atmosphere, a space-based solution needed. Here we envisage what far-IR Great Observatory class mission might look like context Origins Space Telescope (OST) Infrared Interferometric (SPIRIT), consider multiple point...
Astronomical observations in the far-infrared are critical for investigation of cosmic microwave background (CMB) radiation and formation evolution planets, stars galaxies. In case space telescope receivers a strong heritage exists corrugated horn antenna feeds to couple signals detectors mounted waveguide or cavity structure. Such have been utilized, example, Planck satellite both single-mode channels observation CMB multi-mode optimized detection foreground sources. Looking demands future...
Microwave Kinetic Inductance Detectors (MKIDs) combine significant advantages for photon detection like single counting, pixel energy resolution, vanishing dark counts and µs time resolution with a simple design the feasibility to scale up into megapixel range. But high quality MKID fabrication remains challenging as established superconductors tend either have intrinsic disadvantages, are deposit or require very low operating temperatures. As alternating stacks of thin Ti TiN films shown...
Far-infrared (far-IR) astronomical observations with sub-arcsecond angular resolution and high spectral require a space-based interferometer observatory baselines of at least tens meters in length. The European-funded Far Infrared Space Interferometer Critical Assessment (FISICA) studied (FIRI) detail, developed software simulation tools (FIInS PyFIInS) for modeling FIRI-like simulating the hyperspectral output datacubes. Here we present on-going work expanding upon foundations FIInS pyFIInS...
This paper describes the energy resolution of Microwave Kinetic Inductance Detectors (MKIDs), and models some limiting factors to it. Energy is a measure smallest possible difference in impinging photons, Delta E, that detector can identify critical importance for many applications. Limits cause by Fano effect, amplifier noise, current inhomogeneities, readout sampling frequency are taken into consideration this model. an approach combine all these limitations predict wavelength dependency...
Spectral-spatial interferometry pioneered in a narrow band the near infrared has not enjoyed much exploitation as technique. Proposed promising modulation method for potential Far-infrared future satellite, period of study was performed on two testbeds to improve and evolve this technique laboratory order simplify some technical aspects data analysis involved. Here we will present an update successful upgrade previous wideband millimetric (0.3-1.0 THz) testbed far-IR (11-14THz) one, well...
Microwave Kinetic Inductance Detectors (MKIDs) are a class of superconducting cryogenic detectors that simultaneously exhibit energy resolution, time resolution and spatial resolution. The pixel yield MKID arrays is usually critical figure merit in the characterisation an MKIDs array. Currently, for intended detection optical near-infrared photons, only best as high 75-80%. uniformity film used fabrication often regarded main limiting factor to In this paper we will present data on...
At DIAS, in collaboration with Trinity College Dublin, we are developing visible and near-infrared Microwave Kinetic Inductance Detectors (MKIDs) for astronomical applications. By designing an array of MKIDs different resonant frequencies, thousands detectors can be readout inherent frequency domain multiplexing (FDM). The Xilinx ZCU111 Radio Frequency System on Chip (RFSoC) Evaluation Kit is a very promising option not only Detector (MKID) systems, but also any application relying...
Microwave Kinetic Inductance Detector (MKID) arrays are currently being developed and deployed for astronomical applications in the visible near infrared sub-millimetre astronomy. One of main drawbacks MKIDs is that large would exhibit a pixel yield, percentage individually distinguishable pixels to total number pixels, 75 - 80 %. Imperfections arising during fabrication can induce an uncontrolled shift resonance frequency individual resonators which end up resonating at same different...
Unexpected diffraction effects can become a real issue for the correct operation of far infrared wide field spatio-spectral interferometers now being proposed. Beam sizes may be too small in terms wavelength to remain collimated over inter-component distances encountered such systems. This results some components located Fresnel zone an image pupil or sky and geometrical optics becoming unreliable. In presentation we demonstrate application various long-wavelength quasi-optical approaches We...
Multimode horn antennas can be utilized as high efficiency feeds for bolometric detectors, providing increased throughput and sensitivity over single mode feeds, while also ensuring good control of beam pattern characteristics. horns were employed in the highest frequency channels European Space Agency Planck Telescope, have been proposed future terahertz instrumentation, such SAFARI SPICA. The radiation a multimode is affected by details coupling higher order waveguide modes to bolometer...
Multi-mode horns combined with bolometric or incoherent detectors are finding application in astronomical receivers for which partially coherent operation can provide increased throughput and thus sensitivity. This is advantageous when observing faint sources, especially if diffraction limited resolution not required, the horn beam truncated by a cold stop optical train. We discuss how such be simulated present examples from receiver instrumentation on Planck SPICA space telescopes.