2014
DOI: 10.1063/1.4881183
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Optically pumped whispering-gallery mode lasing from 2-μm GaN micro-disks pivoted on Si

Abstract: 2-μm micro-disks containing InGaN/GaN quantum wells supported on a tiny Si nanotip are fabricated via microsphere lithography followed by dry and wet etch processes. The micro-disks are studied by photoluminescence at both room-temperature and 10 K. Optically pumped blue lasing at room-temperature is observed via whispering-gallery modes (WGMs) with a lasing threshold as low as 8.43 mJ/cm2. Optical resonances in the micro-disks are studied through numerical computations and finite-difference time-domain simula… Show more

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Cited by 45 publications
(29 citation statements)
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“…A magnified view of the sidewall shown in Fig. 2(c) reveals some minute roughness, which may be correlated to the presence of dislocations at the boundary of the microdisk [10]. The sandwich structure consisting of QWs embedded between p-GaN and n-GaN is also identifiable.…”
mentioning
confidence: 89%
“…A magnified view of the sidewall shown in Fig. 2(c) reveals some minute roughness, which may be correlated to the presence of dislocations at the boundary of the microdisk [10]. The sandwich structure consisting of QWs embedded between p-GaN and n-GaN is also identifiable.…”
mentioning
confidence: 89%
“…This phenomenon has already been observed in GaN-on-Si micro-disk cavities before, in which electronhole plasma (EHP) effects are likely to contribute concurrently. 13 Although thermal effects are not dominant to WGMs in the micro-domes, the broadband PL gain spectrum is influenced by heat accumulation as the Si pivots are the main thermal conduction pathways, resulting in red-shifts of peak wavelengths from $370.6 nm to $373.8 nm as the excitation increased from $0.6E th to $1.1E th . Consequently, mode hopping occurs as the gain red-shifts, as illustrated in FIG.…”
mentioning
confidence: 99%
“…Similar undercut microdisk structures have also been demonstrated by controlled wet-etch removal of the underlying Si substrate using GaN-on-Si materials. 12,13 There also are many other studies on GaN WGM microcavities based on self-assembled micro/ nano crystals using bottom-up methods, including microscale pyramids, hexagonal disks, and pillars. [14][15][16] However, it is difficult to achieve precise control over the locations, morphologies, dimensions, and uniformities of these microstructures during growth.…”
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confidence: 99%
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“…В то же время, согласно анализу эксперимен-тальных зависимостей, рядом авторов были получены следующие значения β для МШГ: 0.02−0.85 в ZnSe микродисках с CdSe квантовыми точками (КТ) [19]; 0.61 в GaAsAlGaAs микропилларах с InAs КТ [20]; 0.14 в GaN микродисках c InGaN квантовой ямой (КЯ) [21]; 0.1 в GaInAsP микродисках [22]; 0.09 в (Al,Ga)As/GaAs микродисках с InAs КТ [17]. Наилучшая аппроксимация экспериментальной зависимости (рис.…”
Section: микрофотолюминесценция микродисковunclassified