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Wu J Z, Long H, Shi X L, Luo S, Chen Z H et al. Polariton lasing in InGaN quantum wells at room temperature. Opto-Electron Adv 2, 190014 (2019). doi: 10.29026/oea.2019.190014
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Original Article Open Access
Polariton lasing in InGaN quantum wells at room temperature
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Abstract
In this paper, we report the exciton polaritons in both positive and negative detuning micro cavities based on InGaN multi-quantum wells (MQWs) and the first polariton lasing in InGaN/GaN MQWs at room temperature by utilizing a 4.5λ Fabry-Perot (F-P) cavity with double dielectric distributed Bragg reflectors (DBRs). Double thresholds corresponding respectively to polariton lasing and photonic lasing are observed along with half-width narrowing and peak blue-shifts. The threshold of polariton lasing is about half of the threshold of photonic lasing. Our results paved a substantial way for ultra-low threshold lasers and room temperature Bose-Einstein Condensate (BEC) in nitride semiconductors.-
Keywords:
- exciton-polariton /
- polariton lasing /
- InGaN QWs
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References
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Wu J Z, Long H, Shi X L, Luo S, Chen Z H et al. Polariton lasing in InGaN quantum wells at room temperature. Opto-Electron Adv 2, 190014 (2019). doi: 10.29026/oea.2019.190014
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Figure 1.
(a) Sample structure of InGaN/GaN MQWs microcavity for strong coupling. (b) The optical field in the microcavity with MQWs placed on the antinode. (c) and (d) Photoluminescence spectrums of bare wafer at 15 K and 300 K.
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Figure 2.
(a) Schematic of angle-resolved micro-PL setup. (b) Schematic of angle-resolved PL Fourier image setup. (c) The angle resolved micro-PL of positive detuning sample. (d) LPB and UPB dispersion curves fitted by coupled oscillator model. (e) The angle resolved micro-PL Fourier image of negative detuning sample.
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Figure 3.
(a) The dependence of luminous intensity, peak position and half-width of LPB on the excitation power with double nonlinear regimes. (b) Enlarged polariton lasing region with linear coordinates. (T1 and T2 denote the polariton lasing threshold and photonic lasing threshold)
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Figure 4.
The k-space mapping of exciton polaritons under different excitation power.
