The origin and influence of non-cavity modes in a micropillar Bragg microcavity

Abstract

Controlling the photonic environment of emitters is essential to the design of classical and quantum light sources. We study the case of a dipole-like emitter in a cylindrical pillar etched into a planar Bragg microcavity, which is a common design of quantum-dot single photon source. In addition to the well-known cavity modes created by the high-reflectivity of the Bragg mirrors at small in-plane wavevectors, we show the presence of broad spectral features that play a key role in controlling photon collection efficiency and Purcell enhancement. These non-cavity modes are insensitive to the periodic index modulation of the Bragg reflectors, but arise from the cylindrical pillar geometry, as we show by comparison with simulations of uniform pillars, which reproduce the non-cavity modes. This approach provides a tool for understanding and modelling these often-disregarded decay channels as a function of source height, cavity dimensions and surface layers.

9 pages, 5 figures

References in corpus (7)

• Fault-tolerant quantum computation with high threshold in two dimensions
• Design study for an efficient semiconductor quantum light source operating in the telecom C-band based on an electrically-driven circular Bragg grating
• High extraction efficiency source of photon pairs based on a quantum dot embedded in a broadband micropillar cavity
• Bullseye dielectric cavities for photon collection from a surface-mounted quantum-light-emitter
• Direct-write projection lithography of quantum dot micropillar single photon sources
• Probing Purcell enhancement and photon collection efficiency of InAs quantum dots at nodes of the cavity electric field
• Design principles for >90% efficiency and >99% indistinguishability broadband quantum dot cavities