Date

Place

Room C (Room 323)
3. LEDs and Lighting I
August 19, 2015 (Wednesday)
09:00 ~ 10:30

[3-1]
09:00 ~ 09:25
Title:[Invited] Polarization Controlled Light Emitters Based on Elongated InGaN/GaN Pyramidal Quantum Dots
Per Olof Holtz, Chih-Wei Hsu, Martin Eriksson, Houssaine Machhadani, Tomas Jemson, K. Fredrik Karlsson, and Erik Janzen (Linkoping Univ., Sweden)
Abstract: Polarized light is the key for a wide range of optoelectronic technologies from optical interconnects and LCD-displays to quantum computing and cryptography. Instead of filtering unpolarized light, i.e. the technology primarily used today, we present a novel approach, in which GaN pyramidal structures with InGaN quantum dots (QDs) formed on the slightly truncated top of the GaN pyramids are employed. The dots are formed due to the accumulated strain caused by the lattice mismatch. Well-defined single excitonic emission lines appearing at around 400 nm are monitored from the dots in ?-photoluminescence spectra. In a subsequent step, elongated pyramids are instead fabricated. The QDs formed on top of these elongated pyramids are extended, following the ridge of the pyramids. The excitonic emission from these extended dots exhibit a strong degree of linear polarization, about 85%, in the direction of the elongation. For demonstration of the single photon characteristics of these dots, temporal photon correlation spectroscopy has been performed. An excitonic single photon emission and a biexcitonic photon bunching from the pyramidal dots have been monitored, confirming sound single photon properties of these dots.
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