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Yellow-orange lights, valuable in photodynamic therapies, spectroscopy, and optogenetics, are limited by the narrow bandwidth and bulky setup via the conventional Raman or optical parametric oscillation processes. Moreover, flatness in the broad-band spectrum is also important for the aforementioned applications with extended functions. In this paper, by carefully designing grating-periods of a step-chirped PPMgLN ridge waveguide for sum frequency generation (SFG), we report a compact broad-band yellow-orange light with bandwidth of 5.
View Article and Find Full Text PDFSimultaneous Characterization of Two Ultrashort Optical Pulses at Different Frequencies Using a WS Monolayer.
ACS Photonics
June 2022
Kavli Institute of Nanoscience Delft, Department of Quantum Nanoscience, Delft University of Technology, Lorentzweg 1, 2628 CJ Delft, The Netherlands.
The precise characterization of ultrashort laser pulses has been of interest to the scientific community for many years. Frequency-resolved optical gating (FROG) has been extensively used to retrieve the temporal and spectral field distributions of ultrashort laser pulses. In this work, we exploit the high, broad-band nonlinear optical response of a WS monolayer to simultaneously characterize two ultrashort laser pulses with different frequencies.
View Article and Find Full Text PDFNumerical investigation of vibration and noise radiation of a water supply pipeline.
Environ Sci Pollut Res Int
July 2022
School of Transportation, Southeast University, Nanjing, 211189, China.
The vibration and noise radiation from underwater structures can be harmful for aquatic ecosystems, especially for endangered species which are sensitive to particle motion and sound pressure. In this study, a water supply pipeline was chosen to investigate the flow-induced vibration and underwater noise radiation. A finite element model was developed to predict the vibration of the pipeline-tunnel-soil coupling system using fluid-structure interaction analysis.
View Article and Find Full Text PDFIntegrated Molecular Optomechanics with Hybrid Dielectric-Metallic Resonators.
ACS Photonics
December 2021
Center for Nanophotonics, AMOLF, Science Park 104, 1098 XG Amsterdam, The Netherlands.
Molecular optomechanics describes surface-enhanced Raman scattering using the formalism of cavity optomechanics as a parametric coupling of the molecule's vibrational modes to the plasmonic resonance. Most of the predicted applications require intense electric field hotspots but spectrally narrow resonances, out of reach of standard plasmonic resonances. The Fano lineshapes resulting from the hybridization of dielectric-plasmonic resonators with a broad-band plasmon and narrow-band cavity mode allow reaching strong Raman enhancement with high- resonances, paving the way for sideband resolved molecular optomechanics.
View Article and Find Full Text PDFSuppression of ambient stray field for alkali magnetometer of nuclear magnetic resonance gyroscopes: Modeling and experiment.
Rev Sci Instrum
September 2020
Institute of Systems Engineering, Mianyang 621999, China.
In nuclear magnetic resonance gyroscopes (NMRGs), an ambient stray field should be suppressed to maximize performance of the in situ parametrically modulated alkali magnetometer (PMAM). Transfer functions of the PMAM of NMRGs decoupled with lock-in amplifiers are obtained by theoretical and simulation identification. It is found that the frequency bandwidth of the PMAM of NMRGs decoupled by lock-in amplifiers depends largely upon the low-pass filter of the lock-in amplifiers.
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