Abstract
We propose and demonstrate reconfigurable microfiber-coupled photonic crystal (PhC) lasers. In this generic configuration, the position of a PhC resonator can be defined (and redefined) repeatedly by simply relocating a curved microfiber along the linear PhC waveguide. In the proximity of the PhC waveguide in contact with the microfiber, the cutoff frequency (effective index) of the PhC waveguide becomes smaller (larger) than that of a bare PhC waveguide. Accordingly, when a curved microfiber is in contact with the PhC waveguide, a linear PhC resonator having Gaussian-shaped potential well is formed. Experimentally we confirm the formation of the reconfigurable resonator by observing laser operation slightly below three available band edges.
Highlights
Owing to the advancement of photonic crystal (PhC) technologies, various small and high-Q optical cavities have been reported recently [1,2,3]
We propose and demonstrate reconfigurable microfiber-coupled photonic crystal (PhC) lasers
When a curved microfiber is in contact with the PhC waveguide, a linear PhC resonator having Gaussian-shaped potential well is formed
Summary
Owing to the advancement of photonic crystal (PhC) technologies, various small and high-Q optical cavities have been reported recently [1,2,3]. In order to realize meaningful single photon sources, the precise control is required for the spatial and spectral overlap of the cavity resonance with that of a quantum dot. For this reason, the post trimming of the cavity properties is in great demand, to relax fabrication tolerances and to optimize individual components. We propose and demonstrate a novel microfiber-coupled linear PhC slab waveguide resonator that can be spatially reconfigured This reconfigurable PhC resonator is expected to provide the accurate overlap of the resonant cavity with a quantum dot spatially and spectrally, in addition to the simple photon out-coupling with high efficiency
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