Abstract
A microfiber-coupled dual-rail nanobeam resonator is proposed and demonstrated. The dual-rail scheme is employed to encourage the overlap between the light emitter and the air mode. The one-dimensional resonant cavity is formed by contacting a curved microfiber with the dual-rail nanobeam. The finite width of the dual-rail nanobeam turns out to be advantageous for both out-coupling with the microfiber and broader tuning of resonant wavelength. By employing InGaAsP quantum well gain medium, a simple and robust reconfigurable laser is created. Experimentally we measure a quality factor of 11,000 and out-coupling efficiency of 30%. The spontaneous emission factor (β) of the nanobeam laser is measured to be 0.16. Computationally we identified a resonant cavity with a quality factor over 6 × 10(5) and out-coupling efficiency over 90%.
Highlights
Photonic crystal (PhC) cavities with high quality factor (Q) and small mode volume (Vm≡ ∫UdV/Umax) have been widely studied and applied for switching devices and single photon sources [1,2,3,4,5,6,7,8]
The resonant mode created by this way stems from the air mode in which photon energy is mostly concentrated in the air region rather than the dielectric medium
We investigate dual-rail nanobeam structures to enhance the overlap between the mode of interest and the gain medium
Summary
Photonic crystal (PhC) cavities with high quality factor (Q) and small mode volume (Vm≡ ∫UdV/Umax) have been widely studied and applied for switching devices and single photon sources [1,2,3,4,5,6,7,8]. Various nanolasers with low thresholds and large spontaneous emission factors (β) have been demonstrated [13,14] These mechanically-interesting 1D ladder type resonators have been employed widely as a platform to study optomechanical interactions between photons and phonons [15]. We investigate dual-rail nanobeam structures to enhance the overlap between the mode of interest and the gain medium. This dual-rail structure consists of a waveguide laterally-sandwiched between two 1D air-hole arrays. The spatial reconfigurability of the cavity is a powerful option for single photon sources based on selfassembled quantum dots and the fiber-coupled structure of high Q/Vm is advantageous for optical switching applications
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