September 2017
Spotlight Summary by Qing Gu
Thresholdless quantum dot nanolaser
Lasers without threshold have been a pursuit for decades in the search for the ultimate energy-efficient coherent light source. Such devices have become a possibility as laser cavities shrink in size, while quantum efficiency of gain media and excitation schemes become higher. However, the lack of a clear threshold transition in thresholdless lasers hinders the identification of true lasing behavior through the “kink” region in the light-in-light-out curve. In this work, within the same photonic crystal cavity with quantum dot gain, Ota and co-authors demonstrate both thresholded and thresholdless lasing by employing different optical excitation schemes. This enables them to systematically investigate and compare the two kinds of lasing in the same device. They confirm their observation both experimentally, with measurement of the second-order coherence, and theoretically, with a semiconductor laser model.
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Article Information
Thresholdless quantum dot nanolaser
Yasutomo Ota, Masahiro Kakuda, Katsuyuki Watanabe, Satoshi Iwamoto, and Yasuhiko Arakawa
Opt. Express 25(17) 19981-19994 (2017) View: Abstract | HTML | PDF