Yungui Ma

Yungui Ma

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Academic Career Length

19Years (2008-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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28 February 2020 in Light: Science & Applications
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Journal Article
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JGJingshu Guo
Jingshu Guo
JLJiang Li
Jiang Li
CLChaoyue Liu
Chaoyue Liu
YYYanlong Yin
Yanlong Yin
WWWenhui Wang
Wenhui Wang
Daoxin DaiDaoxin Dai
Daoxin Dai
Graphene has attracted much attention for the realization of high-speed photodetection for silicon photonics over a wide wavelength range. However, the reported fast graphene photodetectors mainly operate in the 1.55 μm wavelength band. In this work, we propose and realize high-performance waveguide photodetectors based on bolometric/photoconductive effects by introducing an ultrathin wide silicon−graphene hybrid plasmonic waveguide, which enables efficient light absorption in graphene at 1.55 μm and beyond. When operating at 2 μm, the present photodetector has a responsivity of ~70 mA/W and a setup-limited 3 dB bandwidth of >20 GHz. When operating at 1.55 μm, the present photodetector also works very well with a broad 3 dB bandwidth of >40 GHz (setup-limited) and a high responsivity of ~0.4 A/W even with a low bias voltage of −0.3 V. This work paves the way for achieving high-responsivity and high-speed silicon–graphene waveguide photodetection in the near/mid-infrared ranges, which has applications in optical communications, nonlinear photonics, and on-chip sensing.
12 November 2014 in Physical Review Letters
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YMYungui Ma
Yungui Ma
YLYichao Liu
Yichao Liu
MRMuhammad Raza
Muhammad Raza
YWYudong Wang
Yudong Wang
Sailing HeSailing He
Sailing He
Invisible cloaks have been widely explored in many different physical systems but usually for a single phenomenon for one device. In this Letter we make an experimental attempt to show a multidisciplinary framework that has the capability to simultaneously respond to two different physical excitations according to predetermined scenarios. As a proof of concept, we implement an electric-thermal bifunctional device that can guide both electric current and heat flux “across” a strong ‘scatterer’ (air cavity) and restore their original diffusion directions as if nothing exists along the paths, thus rendering dual cloaking effects for objects placed inside the cavity. This bifunctional cloaking performance is also numerically verified for a line-source nonuniform excitation. Our results and the fabrication technique presented here will help broaden the current research scope for multiple disciplines and may pave a way to manipulate multiple flows and create new functional devices, e.g., for on-chip applications.
28 June 2009 in Nature Materials
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Journal Article
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YMYungui Ma
Yungui Ma
COC. K. Ong
C. K. Ong
TTTomáš Tyc
Tomáš Tyc
ULUlf Leonhardt
Ulf Leonhardt
2 October 2018 in Nature Communications
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JYJiang Yang
Jiang Yang
WDWei Du
Wei Du
YSYishu Su
Yishu Su
YFYang FU
Yang FU
SGShaoxiang Gong
Shaoxiang Gong
YMYungui Ma
Yungui Ma
Thermal radiation can be substantially enhanced in the near-field scenario due to the tunneling of evanescent waves. Monolayer graphene could play a vital role in this process owing to its strong infrared plasmonic response, however, which still lacks an experimental verification due to the technical challenges. Here, we manage to make a direct measurement about plasmon-mediated thermal radiation between two macroscopic graphene sheets using a custom-made setup. Super-Planckian radiation with efficiency 4.5 times larger than the blackbody limit is observed at a 430-nm vacuum gap on insulating silicon hosting substrates. The positive role of graphene plasmons is further confirmed on conductive silicon substrates which have strong infrared loss and thermal emittance. Based on these, a thermophotovoltaic cell made of the graphene–silicon heterostructure is lastly discussed. The current work validates the classic thermodynamical theory in treating graphene and also paves a way to pursue the application of near-field thermal management.
6 February 2017 in Applied Physics Letters
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SZShuomin Zhong
Shuomin Zhong
WJWei Jiang
Wei Jiang
PXPeipeng Xu
Peipeng Xu
TLTaijun Liu
Taijun Liu
JHJifu Huang
Jifu Huang
YMYungui Ma
Yungui Ma
In this work, the authors proposed a thin artificial structure that could give rise to the strong reduction of both radar wave reflection and infrared thermal emission. This is realized by the subtle combination of two specifically designed metasurface layers that control the infrared emission and microwave absorption, respectively. Our measurement shows that the fabricated sample could have wideband absorption from 3–8 GHz with attenuation efficiency larger than 90% up to incident angles of 30°. In the infrared atmosphere window, it gives a very low emission value of about 0.2. These results show that our sample is practically very promising for the application of a radar-infrared bi-stealth technology.
13 June 2018 in Optics Express
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SZShuomin Zhong
Shuomin Zhong
LWLijie Wu
Lijie Wu
TLTaijun Liu
Taijun Liu
JHJifu Huang
Jifu Huang
WJWei Jiang
Wei Jiang
YMYungui Ma
Yungui Ma
We report a multifunctional metamaterial composite structure that not only provides the broadband radar and thermal infrared bi-stealth function but also possesses an in-band microwave transmission window and high optical transparency. It is composed of four metasurface layers made of indium tin oxide (ITO) films with different surface resistances, which are specifically designed to sequentially control the infrared emission, microwave absorption and transmission. The fabricated sample exhibits a low reflectivity less than 10% in 1.5-9 GHz and a transmission peak of 50% around 3.8 GHz up to the incident angle of 30 degrees. In the infrared atmosphere window, a low thermal emissivity of about 0.52 is achieved. Meanwhile, it keeps good optical transparency by the use of the ITO films. The optically transparent, low-infrared-emissivity, radar-reflectionless and frequency-selective-transmission properties will enable the promising application of communication-compatible multispectral stealth technology.