Abstract
A transformation-optics wedge waveguide designed for the simultaneous collection and directional collimation of pulsed dipole radiation is described and tested with numerical simulation. Azimuthal compression of free space toward a narrow fan-shaped waveguide sector allows dipole pulse radiation in free space to be transformed into a directional non-dispersive pulse propagating within that sector. The collection and collimation ability of the proposed structure is compared with classical approaches using metallic wedge mirrors and parabolic mirrors, which inherently allow multiple internal reflections and thus generate significant pulse distortion and low light-collection efficiency. It is shown that the optical pulse generated by the dipole and propagated through the proposed transformation-optics waveguide maintains its original shape within the structure, and demonstrates enhanced optical power.
Highlights
The collection and collimation of optical radiation from dipole quantum emitters has been an important subject for practical application as well as fundamental research
The classical approaches for collecting and collimating optical dipole radiation are limited in their efficiency (Fig. 1)
Several promising proposals based on transformation optics that address the problem of dipole radiation have been reported, with noticeable examples as directional antennas [21,22,23], flat focus lenses [24, 25], and quad-beam cylindrical-to-plane wave converters [26, 27]
Summary
The collection and collimation of optical radiation from dipole quantum emitters has been an important subject for practical application as well as fundamental research. In this situation, waveguide dispersion can be significant due to multiple reflections within the wedge, and diode radiation with a very short pulse width and a wide spectral bandwidth cannot maintain its shape during propagation. Several promising proposals based on transformation optics that address the problem of dipole radiation have been reported, with noticeable examples as directional antennas [21,22,23], flat focus lenses [24, 25], and quad-beam cylindrical-to-plane wave converters [26, 27].
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