tailieunhanh - Báo cáo hóa học: " Cavity Enhancement of Single Quantum Dot Emission in the Blue"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Cavity Enhancement of Single Quantum Dot Emission in the Blue | Nanoscale Res Lett 2010 5 608-612 DOI S11671-009-9514-4 NANO EXPRESS Cavity Enhancement of Single Quantum Dot Emission in the Blue Robert A. Taylor Anas F. Jarjour Daniel P. Collins Mark J. Holmes Rachel A. Oliver Menno J. Kappers Colin J. Humphreys Received 19 November 2009 Accepted 10 December 2009 Published online 27 December 2009 The Author s 2009. This article is published with open access at Abstract Cavity-enhanced single-photon emission in the blue spectral region was measured from single InGaN GaN quantum dots. The low-Q microcavities used were characterized using micro-reflectance spectroscopy where the source was the enhanced blue output from a photonic crystal fibre. Micro-photoluminescence was observed from several cavities and found to be 10 times stronger than typical InGaN quantum dot emission without a cavity. The measurements were performed using non-linear excitation spectroscopy in order to suppress the background emission from the underlying wetting layer. Keywords InGaN Quantum dot Single-photon source Microcavity Introduction In recent years the use of III-nitride semiconductor materials in optoelectronic devices has grown significantly in step with the ability to control and manipulate their material properties. Commercial applications based around the white and blue-violet light-emitting diodes and edgeemitting laser diodes 1 have attracted much interest along with the demonstration of room temperature optically pumped vertical-cavity surface-emitting lasers VCSELs 2 . Recent advances in the growth of uniform epitaxial R. A. Taylor El A. F. Jarjour D. P. Collins M. J. Holmes Clarendon Laboratory Department of Physics University of Oxford Parks Road Oxford OX1 3PU Uk e-mail R. A. Oliver M. J. Kappers C. J. Humphreys Department of Materials Science and Metallurgy University of Cambridge Pembroke Street Cambridge CB2 3QZ UK 0 Springer nitride layers has enabled a significant increase in the .