Abstract
We report the observation of whispering gallery modes (WGM) in high quality GaAs/AlAs pillar microcavities defined by electron-beam lithography and electron cyclotron resonance reactive ion etching. Photoluminescence experiments, conducted using InAs quantum dots as an internal probe, reveal a remarkably simple WGM spectrum, consisting of a single series of TE modes. For diameters ranging from 3 to 4 mum, Q-factors in excess of 15 000 were measured, allowing for WGM lasing. Noticeably, sub-micron diameter micropillars also display high Qs (~ 1000), close to the limit set by intrinsic radiative losses. These results open the way to the development of original microlasers and improved quantum-dot single photon sources.
Highlights
GaAs/AlAs pillar microcavities have been extensively studied over the last twenty years in view of a better control of light-matter interaction processes in semiconductors and related applications in optoelectronics
We report the observation of whispering gallery modes (WGM) in high quality GaAs/AlAs pillar microcavities defined by electron-beam lithography and electron cyclotron resonance reactive ion etching
We show that micropillar can sustain high quality factor whispering gallery modes (WGM), which are more commonly observed in semiconductor microdisks [13, 14, 15, 16, 17]
Summary
GaAs/AlAs pillar microcavities have been extensively studied over the last twenty years in view of a better control of light-matter interaction processes in semiconductors and related applications in optoelectronics. Theoretical studies revealed their potential for the control of spontaneous emission of a semiconductor active medium [4, 5] This idea could be fully exploited by combining micropillars and quantum dots [6]. Benefiting from the atom-like properties of QDs, numerous quantum optics experiments have been performed, and noticeably the demonstration of the Purcell effect [7, 8, 9, 10] and of single-QD vacuum Rabi oscillation [11] These microcavity effects are, or will be, exploited in novel photonic devices, such as single mode QD single photon sources [8, 9, 10] or photonic switches operating on the single photon level [12]. Practical assets of the pillar geometry, as well as the coexistence of conventional pillar modes and WGMs, open appealing opportunities in the fields of microlasers and single photon sources
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