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Related publications (19)

Linearly uncoupled resonators for ultrabroadband resonant frequency doubling on chip

Microresonators serve as powerful platforms for enhancing second-order nonlinear optical interactions, such as second-harmonic generation. Nevertheless, their performance has traditionally been limited by dispersion-related constraints, including phase-matching and doubly resonant conditions, which restrict operation to narrow bandwidths. In this work, we overcome these limitations by demonstrating ultrabroadband resonant frequency doubling in a novel SiN integrated device. The system features an electrical

SPIE2026

COSMOS-Web: Comprehensive Data Reduction for Wide-area JWST NIRCam Imaging

We present the data reduction methodology used for the COSMOS-Web survey JWST NIRCam data. Covering 0.54 deg 2 with four broadband filters (F115W, F150W, F277W, F444W) and a total exposure time of approximately 270 hr, COSMOS-Web represents the largest contiguous field surveyed during JWST Cycle 1, posing unique data reduction challenges due to its extensive scale. By combining the official JWST Calibration Pipeline with custom improvements for noise removal, background subtraction, and astrometric alignmen

American Astronomical Society2026

Wafer-scale manufacturing of ultra-broadband, high-power erbium-doped integrated lasers

Erbium (Er) is an attractive gain medium for amplifiers and lasers due to its long excited-state lifetime, low noise and nonlinearity, and temperature stability. Recently developed ultra-low-loss Si 3 N 4 photonic integrated circuits combined with Er ion implantation have enabled high-performance on-chip Er lasers, but manufacturing scalability has been limited by the high 2 MeV implantation required for tightly confined 700-nm-thick waveguides. Here we demonstrate the first fully wafer-scale, foundry-compa

Springer Science and Business Media LLC2026

Hybrid silicon-organic integrated photonic circuits for broadband terahertz field-resolved detection

Terahertz (THz) radiation occupies a spectral region between 100 GHz and 10 THz of growing interest for applications in spectroscopy, imaging, and high-speed communications. In free-space implementations, THz generation and detection are commonly achieved using nonlinear crystals through optical rectification and electro-optic sampling, photoconductive antennas based on III-V semiconductors, or more recently spintronic emitters. While these approaches provide large bandwidth and high fidelity, they typicall

EPFL2026

On the solvable–unsolvable transition due to noise-induced chaos in digital memcomputing

Digital memcomputing machines (DMMs) have been designed to solve complex combinatorial optimization problems. Since DMMs are fundamentally classical dynamical systems, their ordinary differential equations (ODEs) can be efficiently simulated on modern computers. This provides a unique platform to study their performance under various conditions. An aspect that has received little attention so far is how their performance is affected by the numerical errors in the solution of their ODEs and the physical nois

AIP Publishing2026

COSMOS-Web: MIRI Data Reduction and Number Counts at 7.7 μm Using JWST

The COSMOS-Web survey is the largest JWST Cycle 1 General Observer program, covering a contiguous ∼0.54 deg2 area with NIRCam imaging in four broadband filters and a noncontiguous ∼0.2 deg2 with parallel MIRI imaging in a single broadband filter, F770W. Here we present a comprehensive overview of the MIRI imaging observations, the data reduction procedure, the COSMOS-Web MIRI photometric catalog, and the first data release including the entire COSMOS-Web MIRI coverage. Data reduction primarily relies on the

2025

Chip-Scale Optical Frequency Combs for Ultra-Broadband Signal Processing and High-Speed Optical Communications

Chip-scale optical frequency combs have emerged as novel light sources that may disrupt many applications in science and industry. On a technical level, microcombs offer a multitude of narrow-linewidth phase-locked optical carriers that are spaced by free spectral ranges of tens or even hundreds of GHz. This feature makes the devices particularly well-suited for massively parallel optical communications and ultra-broadband photonic-electronic signal processing. In this talk, we will present an overview of o

IEEE Computer Society2025

Frequency-resolved observation of the Hanbury Brown-Twiss effect

Claudio Bruschini

Fast and precise spectrometers have numerous applications in quantum sciences, astronomy, and other fields. Thanks to the recent advances in the technology of single-photon detectors, their timing and spectral resolution approach fundamental limits dictated by the Heisenberg uncertainty principle (HUP) allowing new measurements, which were not possible before. In this work, we present a simple and fast spectrometer based on the LinoSPAD2 detector. With an array of 512 SPADs with a pixel size of 26 um2, we c

SPIE2025

Dataset and UAV Propagation Channel Modeling for LoRa in the 860 MHz ISM Band

LoRa is one of the most widely used low-power wide- area network technology for the Internet of Things. To achieve long-range communication with low power consumption at a low cost, LoRa uses a chirp spread spectrum modulation and transmits in the sub-GHz unlicensed industrial, scientific, and medical (ISM) frequency bands. Due to the rapid densification of IoT networks, it is crucial to obtain tailored channel models to evaluate the performance of LoRa networks. While channel models for cellular technologi

IEEE Computer Society2025

Spiking neural networks for sound localization: A new perspective on illuminating auditory spatial perception

Humans estimate sound source direction using information from their auditory neural system. Traditional methods use auditory cues [e.g., interaural time differences (ITDs) and interaural level differences (ILDs), etc] to perform sound localization. These cues are extracted from binaural signals or decoded from neuronal firing rates. In contrast, we proposed a new computational model that directly localizes sound sources using the firing rates of auditory neurons, eliminating the need for physical cue extrac

Acoustical Society of America (ASA)2025

Biodegradable and Easy-to-Make Broadband Tissue Phantoms Between 0.4 and 6 GHz Based on Phosphate Buffered Saline Solution

Anja Skrivervik

Phosphate buffered saline (PBS) solution is a balanced salt solution employed for cell manipulation in cell culture experiments. In this work, PBS is used as base component for making liquid tissue-equivalent materials, also known as phantoms. For this purpose, the dielectric properties of PBS and other balanced salt solution and cell culture media used in cell culture experiments are measured at different temperatures (9 ∘ C, 21 ∘ C, and 37 ∘ C) with an open-ended coaxial probe. Moreover, the two-pole Cole

Institute of Electrical and Electronics Engineers2024

Three-dimensional magnetohydrodynamic equilibrium of quiescent H-modes in tokamak systems

Olivier Sauter, Basil Duval, Jonathan Graves, Wilfred Anthony Cooper, Trach-Minh Tran, Jonathan Marc Philippe Faustin, Hamish William Patten, Samuel Lanthaler, Madhusudan Raghunathan, Andreas Kleiner

Three dimensional free boundary magnetohydrodynamic equilibria that recover saturated ideal kink/peeling structures are obtained numerically. Simulations that model the JET tokamak at fixed = 1.7% with a large edge bootstrap current that flattens t ...

IOP Publishing2016

Experimental assessment of active electroacoustic absorbers for broadband room modes damping

Active electroacoustic absorbers are membrane absorbers actuated, through a feedback control loop and an electromechanical driver, so as to present optimal sound absorption on a broadband range around the membrane resonance. Taking advantage of the low resonance frequency of conventional loudspeakers, this technique appears as an interesting solution for the damping of low-frequency modes in rooms. This concept has direct applications to real life problems, such as the equalization of sound diffusion in the

I-INCE2015

Time-frequency analysis of long fiber Bragg gratings with low reflectivity

Luc Thévenaz

A new technique to investigate the spatial distribution of the reflection spectrum along fabricated long weak fiber Bragg gratings (FBG) is experimentally demonstrated, together with its potential applications for distributed fiber sensing and broadband signal processing. A short pulsed coherent light signal is launched into a FBG and the signal frequency is scanned through the FBG reflection spectrum. When the pulse duration is set much shorter than the transit time through the grating a time-resolved refl

Optical Society of America2013

Microphone Array Beampattern Characterization for Hands-free Speech Applications

Hervé Bourlard

Spatial filtering is the fundamental characteristic of microphone array based signal acquisition, which plays an important role in applications such as speech enhancement and distant speech recognition. In the array processing literature, this property is formulated upon beam-pattern steering and it is characterized for narrowband signals. This paper proposes to characterize the microphone array broadband beam-pattern based on the average output of a steered beamformer for a broadband spectrum. Relying on t

2012

Coded SC-FDMA for broadband satellite return links

Stefano Rosati

In this paper we deal with Single Carrier Frequency Division Multiple Access (SC-FDMA) as uplink air interface of broadband satellite networks. Interestingly, SC-FDMA enables a significant increase of the spectral efficiency with respect to the state-of-th ...

Ieee Computer Soc2012

BROADBAND BEAMPATTERN FOR MULTI-CHANNEL SPEECH ACQUISITION AND DISTANT SPEECH RECOGNITION

Hervé Bourlard

Spatial filtering is the fundamental characteristic of microphone array based signal acquisition which plays an important role in applications such as speech enhancement and distant speech recognition. In the array processing literature, this property is formulated upon beam-pattern steering and it is characterized for narrowband signals. This paper proposes to characterize the microphone array broadband beam-pattern based on the average output of a steered beamformer for a broadband spectrum. Relying on th

Idiap2011

Ultra-Wideband, Short Pulse Electromagnetics 9

Ultra-wideband (UWB), short-pulse (SP) electromagnetics are now being used for an increasingly wide variety of applications, including collision avoidance radar, concealed object detection, and communications. Notable progress in UWB and SP technologies has been achieved by investigations of their theoretical bases and improvements in solid-state manufacturing, computers, and digitizers. UWB radar systems are also being used for mine clearing, oil pipeline inspections, archeology, geology, and electronic ef

Springer2010

RF MEMS Switches for Wide-band (5 - 40 GHz), Tuneable Filters and DMTL Phase Shifters

Montserrat Fernandez-Bolanos Badia

In wireless communications, radio frequency micro-electro-mechanical systems (RF MEMS) technology is attracting tremendous interest across the world as the needs of frequencies gets higher, data bandwidth gets larger and multiple broadband signals have to ...

EPFL2010

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Related publications (19)

Biodegradable and Easy-to-Make Broadband Tissue Phantoms Between 0.4 and 6 GHz Based on Phosphate Buffered Saline Solution

Anja Skrivervik

Institute of Electrical and Electronics Engineers2024