Results 41 to 50 of about 25,049 (217)

Quantum noise in heterodyne detection [PDF]

IEEE Journal of Quantum Electronics, 1987
A fully quantum mechanical theory of diode mixers which includes quantization of the external circuit is presented. We find that Tucker's theory for SIS mixer conversion efficiencies is correct, but that his expression for the measurement noise must be augmented by an amount corresponding to half a photon at every frequency to which the mixer responds.
Wengler, Michael J., Woody, David P.
openaire   +2 more sources

Transducers Across Scales and Frequencies: A System‐Level Framework for Multiphysics Integration and Co‐Design

Advanced Materials Technologies, EarlyView.
Transducers convert physical signals into electrical and optical representations, yet each mechanism is bounded by intrinsic trade‐offs across bandwidth, sensitivity, speed, and energy. This review maps transduction mechanisms across physical scale and frequency, showing how heterogeneous integration and multiphysics co‐design transform isolated ...
Aolei Xu, Mengyao Xiao, Zhouli Sui, Yinpeng Wang, Daoye Zheng, Yuxin Liu, Luwei Wang, Huajun Liu, Chengkuo Lee   +8 more
wiley   +1 more source

On-chip coherent detection with quantum limited sensitivity

Scientific Reports, 2017
While single photon detectors provide superior intensity sensitivity, spectral resolution is usually lost after the detection event. Yet for applications in low signal infrared spectroscopy recovering information about the photon’s frequency ...
Vadim Kovalyuk, Simone Ferrari, Oliver Kahl, Alexander Semenov, Michael Shcherbatenko, Yury Lobanov, Roman Ozhegov, Alexander Korneev, Nataliya Kaurova, Boris Voronov, Wolfram Pernice, Gregory Gol’tsman   +11 more
doaj   +1 more source

Enhancement and Speed‐Up of Carrier Dynamics in A Dielectric Nanocavity with Deep Sub‐Wavelength Confinement

Laser &Photonics Reviews, EarlyView.
This work presents the first experimental investigation of ultrafast dynamics in dielectric bowtie nanocavities, featuring deep‐subwavelength mode confinement. Measurements reveal enhanced two‐photon absorption, sub‐picosecond carrier relaxation, and strong pump–probe interactions, demonstrating clear advantages over conventional nanocavities for low ...
Gaoneng Dong, Ali Nawaz Babar, Rasmus Ellebæk Christiansen, Søren Engelberth Hansen, Søren Stobbe, Yi Yu, Jesper Mørk   +6 more
wiley   +1 more source

Research on the temperature inversion accuracy based on spatial heterodyne interferometric spectroscopy observation in mesosphere and lower thermosphere

Terrestrial, Atmospheric and Oceanic Sciences
The O2 A-band night glow hyperspectral detection data can be used for temperature estimation in the MLT (Mesosphere and Lower Thermosphere). The SHS (Spatial Heterodyne Spectrometer), which has the characteristics of high stability, high throughput and ...
Weijia Wang, Haiyan Luo, Zhiwei Li, Wei Xiong   +3 more
doaj   +1 more source

Heterodyne-Based Detection Approach for Future Generation Fiber-Wireless Communication Links With the Aid of Machine Learning

IEEE Access
Observing the evolution of mobile communication networks across successive generations, frequency band allocation has progressively expanded both in quantity and frequency.
Guo Hao Thng, Said Mikki
doaj   +1 more source

Germanium‐Based Mid‐Infrared Integrated Photonics

Laser &Photonics Reviews, EarlyView.
The mid‐infrared (mid‐IR) spectral range is a part of the electromagnetic spectrum in which most of the molecules have vibrational and rotational resonances. Photonics integration in this wavelength range have thus seen a burst of interest in the recent years, mainly driven by applications related with the detection of chemical and biological ...
Delphine Marris‐Morini, Goran Z. Mashanovich, Milos Nedeljkovic, Carlos Alonso‐Ramos, Laurent Vivien, Jacopo Frigerio, Giovanni Isella   +6 more
wiley   +1 more source

Verification of Laser Heterodyne Interferometric Bench for Chinese Spaceborne Gravitational Wave Detection Missions

Research
Construction of laser heterodyne interferometric bench to measure tiny translation and tilt with picometer- and nanoradian-level sensitivity in the millihertz band is critical for the success of spaceborne gravitational wave detection, including the LISA,
Xin Xu, Heshan Liu, Yidong Tan
doaj   +1 more source

Laser Absorption Shock Tube Study of C1 to C4 n‐Alkyl Formate Pyrolysis

International Journal of Chemical Kinetics, Volume 58, Issue 5, Page 199-209, May 2026.
ABSTRACT n$n$‐Alkyl formates are considered as potential alternative fuels or fuel additives. While their oxidation chemistry has been investigated intensely, their pyrolysis chemistry requires more experimental insights. The present work utilizes shock tube experiments in combination with infrared laser absorption measurements to obtain information ...
Malte Döntgen, Alina Wildenberg, Karl Alexander Heufer   +2 more
wiley   +1 more source

Weak Coherent Light Interference Heterodyne Detection Based on Time-Domain Signal Analysis

IET Signal Processing
Weak coherent light interference heterodyne detection is the theoretical basis for fiber optic gyroscopes, optical coherence tomography, and optical time-domain reflectometers.
Hui Shen, Yousen Li
doaj   +1 more source