Department of Optics and Photonics, National Central University, No. 300, Jhongda Rd., Jhongli, 320, Taiwan.
Published: November 2010
AI Article Synopsis
Article Abstract
We report on the modal competition mediated angular dispersion by heterogeneously coupled plasmonic waveguides. By varying the wavelength of the excitation, the surface waves propagate alongside the upper and lower interfaces can be manipulated in coupled, decoupled, and cutoff regimes. Depending on the coupling states, the output beam can be steered between +15° and -17° for wavelength from λ = 695 nm to λ = 675 nm. The maximum achieved angular dispersion can be as large as 2.1°/nm. This finding may revolutionize current design concept of spectrometers, providing a significant way to scale down the form factor further into nano-size.
The combination of reversible angular dispersion-induced microbunching (ADM) and the rapid damping storage ring provides a storage-ring-based light source with the capability to produce longitudinal coherent radiation with a high repetition rate. This paper presents a prototype design for a test facility based on the study by Jiang et al. [Sci.
In situ high-pressure Raman spectroscopy and synchrotron angular dispersive x-ray diffraction techniques, combined with first-principles calculations, have been performed to investigate the 1-methylhydantoin (C4H6N2O2, 1-MH) molecular crystal. High-pressure experiments have shown that phase I (monoclinic system) begins to transform into phase II (orthorhombic system) at pressures above 4.0 GPa, and the transformation range is from 4.
A new real-time feedback system has been designed to enhance beam position and energy at the Shanghai Synchrotron Radiation Facility's hard X-ray nanoprobe beamline.
The system separates the beam position signals into high-frequency and low-frequency components, which are corrected using two different types of optical components with varying inertial masses.
Experimental results show a marked improvement in stability, reducing beam angular fluctuations significantly, from 2.21 to 0.92 µrad RMS horizontally and from 0.72 to 0.10 µrad RMS vertically.
ARC Centre of Excellence for Transformative Meta-Optical Systems (TMOS), Department of Electronic Materials Engineering, Research School of Physics, The Australian National University, Canberra, ACT 2600, Australia.
* This study showcases the first-ever precise control of the emission angle for photon pairs generated in a nonlinear metasurface, achieving high-quality coincidence ratios in the emitted light.
* A silicon dioxide grating on a nonlinear lithium niobate layer was used to facilitate this control, and the findings suggest potential for further improvements through modulation techniques, enhancing the capabilities of photon-pair sources.
We study numerically and experimentally the second-harmonic generation (SHG) from rectangular metagratings of V-shaped gold nanoantennas. We show that by carefully engineering the array pitch to steer the diffraction orders toward the single antenna emission, the extracted signal is maximized. This enhancement is attributed to the angular overlap between the radiation pattern and array factor and is comparable to the improvement yielded by the coupling of surface lattice resonances (SLRs) with local modes.
