Nanostructuring Multilayer Hyperbolic Metamaterials for Ultrafast and Bright Green InGaN Quantum Wells |
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| Authors: | Dylan Lu Haoliang Qian Kangwei Wang Hao Shen Feifei Wei Yunfeng Jiang Eric E. Fullerton Paul K. L. Yu Zhaowei Liu |
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| Affiliation: | 1. Department of Electrical and Computer Engineering, University of California, San Diego, CA, USA;2. Center for Memory and Recording Research, University of California, San Diego, CA, USA;3. Materials Science and Engineering, University of California, San Diego, CA, USA |
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| Abstract: | Semiconductor quantum well (QW) light‐emitting diodes (LEDs) have limited temporal modulation bandwidth of a few hundred MHz due to the long carrier recombination lifetime. Material doping and structure engineering typically leads to incremental change in the carrier recombination rate, whereas the plasmonic‐based Purcell effect enables dramatic improvement for modulation frequency beyond the GHz limit. By stacking Ag‐Si multilayers, the resulting hyperbolic metamaterials (HMMs) have shown tunability in the plasmonic density of states for enhancing light emission at various wavelengths. Here, nanopatterned Ag‐Si multilayer HMMs are utilized for enhancing spontaneous carrier recombination rates in InGaN/GaN QWs. An enhancement of close to 160‐fold is achieved in the spontaneous recombination rate across a broadband of working wavelengths accompanied by over tenfold enhancement in the QW peak emission intensity, thanks to the outcoupling of dominating HMM modes. The integration of nanopatterned HMMs with InGaN QWs will lead to ultrafast and bright QW LEDs with a 3 dB modulation bandwidth beyond 100 GHz for applications in high‐speed optoelectronic devices, optical wireless communications, and light‐fidelity networks. |
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| Keywords: | light‐emitting diodes metamaterials multilayers plasmonics Purcell effect |
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