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| 1 | Highly efficient GaAs solar cells by limiting light emission angle显示文摘In a conventional flat plate solar cell under direct sunlight,light is received from the solar disk,but is re-emitted isotropically.This isotropic emission corresponds to a significant entropy increase in the solar cell,with a corresponding drop in efficiency.Here,using a detailed balance model,we show that limiting the emission angle of a high-quality GaAs solar cell is a feasible route to achieving power conversion efficiencies above 38%with a single junction.The highest efficiencies are predicted for a thin,light trapping cell with an ideal back reflector,though the scheme is robust to a non-ideal back reflector.Comparison with a conventional planar cell geometry illustrates that limiting emission angle in a light trapping geometry not only allows for much thinner cells,but also for significantly higher overall efficiencies with an excellent rear reflector.Finally,we present ray-tracing and detailed balance analysis of two angular coupler designs,show that significant efficiency improvements are possible with these couplers,and demonstrate initial fabrication of one coupler design. | Emily D Kosten Jackson H Atwater James Parsons Albert Polman Harry A Atwater | 2013 | Light(Science & Applications)2013，2，1： | 9 |
| 2 | Enhanced nonlinear optical effects with a tapered plasnaonic waveguide 显示文摘 | Verhagen Ewold Kuipers Laurens Polman Albert | 2007 | Nano Letters2007，7，2： | 1 |
| 3 | Plasmonics for improved photovoltaic devices显示文摘 | Harry A Atwater Albert Polman | 2010 | Nat Mater2010，9，3： | 1 |
| 4 | Plasmonics for improved photovoltaic devices显示文摘 | Atwater Harry A Polman Albert | 2010 | Nature materials2010，9，3： | 1 |
| 5 | Enhancement of Er3+ 4I13/2 population in Y2O3 by energy transfer to Ce3+显示文摘 | Christof Stohhofer Albert Polman | 2001 | Optical Materials2001，17，3： | 1 |
| 6 | Absorption and emission spectroscopy in Er^3+-Yb^3+ doped aluminum oxide waveguides显示文摘 | Christof Strohhofer Albert Polman | 2003 | Optical Material2003，21，4： | 1 |
| 7 | Spontaneous and stimulated electron-photon interactions in nanoscale plasmonic near fields显示文摘The interplay between free electrons,light,and matter offers unique prospects for space,time,and energy resolved optical material characterization,structured light generation,and quantum information processing.Here,we study the nanoscale features of spontaneous and stimulated electron–photon interactions mediated by localized surface plasmon resonances at the tips of a gold nanostar using electron energy-loss spectroscopy(EELS),cathodoluminescence spectroscopy(CL),and photon-induced near-field electron microscopy(PINEM).Supported by numerical electromagnetic boundary-element method(BEM)calculations,we show that the different coupling mechanisms probed by EELS,CL,and PINEM feature the same spatial dependence on the electric field distribution of the tip modes.However,the electron–photon interaction strength is found to vary with the incident electron velocity,as determined by the spatial Fourier transform of the electric near-field component parallel to the electron trajectory.For the tightly confined plasmonic tip resonances,our calculations suggest an optimum coupling velocity at electron energies as low as a few keV.Our results are discussed in the context of more complex geometries supporting multiple modes with spatial and spectral overlap.We provide fundamental insights into spontaneous and stimulated electron-light-matter interactions with key implications for research on(quantum)coherent optical phenomena at the nanoscale. | Matthias Liebtrau Murat Sivis Armin Feisto Hugo Lourenco-Martins Nicolas Pazos-Pérez Ramon A.Alvarez Puebla F.Javier Garcia de Abajo Albert Polman Claus Ropers | 2021 | Light(Science & Applications)2021，10，5： | 1 |
| 8 | Absorption and emission spectroscopy in Er^3+-Yb^3+ doped aluminum oxide waveguides显示文摘 | Christof Strohhofer Albert Polman | 2003 | Optical Materials2003，21，： | 1 |
| 9 | Local structure around Er in silica and sodium silicate glasses 显示文摘 | Matthew A Marcus Albert Polman | 1991 | J Non Cryst Solids1991，136，3： | 1 |
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