ﻻ يوجد ملخص باللغة العربية
Frequency- and time-domain Brillouin spectroscopy are powerful tools to read out the mechanical properties of complex systems in material and life sciences. Indeed, coherent acoustic phonons in the time-domain method offer superior depth resolution and a stronger signal than incoherent acoustic phonons in the frequency-domain method. However, it does not allow multichannel detection and therefore falls short in signal acquisition speed. Here, we present Brillouin spectroscopy that spans time- and frequency-domain to allow multichannel detection of Brillouin scattering light from coherent acoustic phonons. Our technique maps time-evolve Brillouin oscillations in a chromatic-dispersed laser pulses instantaneous frequency. Spectroscopic heterodyning of the Brillouin oscillations in the frequency domain enhances signal acquisition speed by at least 100-fold over the time-domain method. As a proof of concept, we imaged heterogeneous thin films over a wide bandwidth with nanometer depth resolution. We, therefore, foresee that our approach catalyses future phonon spectroscopy toward real-time mechanical imaging.
We theoretically investigate a new class of silicon waveguides for achieving Stimulated Brillouin Scattering (SBS) in the mid-infrared (MIR). The waveguide consists of a rectangular core supporting a low-loss optical mode, suspended in air by a serie
Frequency combs based on terahertz quantum cascade lasers feature broadband coverage and high output powers in a compact package, making them an attractive option for broadband spectroscopy. Here, we demonstrate the first multi-heterodyne spectroscop
Precision laser spectroscopy is key to many developments in atomic and molecular physics and the advancement of related technologies such as atomic clocks and sensors. However, in important spectroscopic scenarios, such as astronomy and remote sensin
We formulate a generic concept of engineering optical modes and mechanical resonances in a pair of optically-coupled light-guiding membranes for achieving cascaded light scattering to multiple Stokes and anti-Stokes orders. By utilizing the light pre
We present an experimental technique for realizing a specific absorption spectral pattern in a rare-earth-doped crystal at cryogenic temperatures. This pattern is subsequently probed on two spectral channels simultaneously, thereby producing an error