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Confined one-way mode at magnetic domain wall for broadband high-efficiency one-way waveguide, splitter and bender
We find the one-way mode can be well-confined at the magnetic domain wall by
the photonic bandgap of gyromagnetic bulk material. Utilizing the well-confined
one-way mode at the domain wall, we demonstrate the photonic one-way waveguide,
splitter and bender can be realized with simple structures, which are predicted
to be high-efficiency, broadband, frequency-independent, reflection-free,
crosstalk-proof and robustness against disorder. Additionally, we find that the
splitter and bender in our proposal can be transformed into each other with
magnetic control, which may have great potential applications in all photonic
integrated circuit.Comment: Appl. Phys. Lett. 100, 041108 (2012); (4 pages
Hanle detection for optical clocks
Considering the strong inhomogeneous spatial polarization and intensity
distribution of spontaneous decay fluorescence due to the Hanle effect, we
propose and demonstrate a universe Hanle detection configuration of
electron-shelving method for optical clocks. Experimental results from Ca
atomic beam optical frequency standard with 423 nm electron-shelving method
show that a designed Hanle detection geometry with optimized magnetic field
direction, detection laser beam propagation and polarization direction, and
detector position can improve the fluorescence collection rate by more than one
order of magnitude comparing with that of inefficient geometry. With the fixed
423 nm fluorescence, the improved 657 nm optical frequency standard signal
intensity is presented. And the potential application of the Hanle detection
geometry designed for facilitating the fluorescence collection for optical
lattice clock with a limited solid angle of the fluorescence collection has
been discussed. This Hanle detection configuration is also effective for ion
detection in ion optical clock and quantum information experiments. Besides, a
cylinder fluorescence collection structure is designed to increase the solid
angle of the fluorescence collection in Ca atomic beam optical frequency
standard.Comment: 5 pages, 6 figure
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