Publications by authors named "Botian Sun"
We introduce the concept of polarized vortex Smith-Purcell radiation by the interaction of an electron beam and cascaded metasurfaces. The spin and orbital angular momenta of Smith-Purcell radiation are determined by the cascaded metasurface that consists of a grating and a phase gradient metasurface. The grating converts the electron beam radiation into the desired polarized light, while the phase gradient metasurface generates the vortex light.
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- Transverse scattering occurs perpendicular to the direction of wave propagation, sparking interest for applications in antennas, metrology, and sensing.
- This study reveals two types of transverse scattering—annular and unidirectional—achieved through the coupling of magnetoelectric Omega particles, with specific modes generating these effects.
- The findings also highlight how manipulating longitudinal and transverse electric/magnetic dipole modes can suppress forward and backward scattering, offering new ways to control light scattering and broaden the use of these particles.
In this paper, we investigated the impact of the linewidth of a QCW pulsed sodium laser on the brightness performance of a generating sodium laser guide star by using the numerical simulation tool PRS. We compared the field test results with the simulation results for two TIPC's 30W class sodium guide star lasers and found the results are in good agreement which proves the tool can be used for prediction. Then, we used the tool to study the influence of D2b repumping and different linewidths from 10MHz to 1GHz on the coupling efficiency and the photon return flux.
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