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| 1 | Giant non-linear susceptibility of hydrogenic donors in silicon and germanium显示文摘Implicit summation is a technique for the conversion of sums over intermediate states in multiphoton absorption and the high-order susceptibility in hydrogen into simple integrals.Here,we derive the equivalent technique for hydrogenic impurities in multi-valley semiconductors.While the absorption has useful applications,it is primarily a loss process;conversely,the non-linear susceptibility is a crucial parameter for active photonic devices.For Si:P,we predict the hyperpolarizability ranges from χ^((3))/n_(3D)=2.9 to 580×10^(−38 )m^(5)/V^(2) depending on the frequency,even while avoiding resonance.Using samples of a reasonable density,n3D,and thickness,L,to produce thirdharmonic generation at 9 THz,a frequency that is difficult to produce with existing solid-state sources,we predict that χ^((3)) should exceed that of bulk InSb and χ^((3))L should exceed that of graphene and resonantly enhanced quantum wells. | Nguyen H.Le Grigory V.Lanskii Gabriel Aeppli Benedict N.Murdin | 2019 | Light(Science & Applications)2019，8，1： | 1 |
| 2 | Highly efficient THz four-wave mixing in doped silicon显示文摘Third-order non-linearities are important because they allow control over light pulses in ubiquitous high-quality centro-symmetric materials like silicon and silica.Degenerate four-wave mixing provides a direct measure of the third-order non-linear sheet susceptibility x^(3)(where L represents the material thickness)as well as technological possibilities such as optically gated detection and emission of photons.Using picosecond pulses from a free electron laser,we show that silicon doped with P or Bi has a value of x^(3)Lin the THz domain that is higher than that reported for any other material in any wavelength band.The immediate implication of our results is the efficient generation of intense coherent THz light via upconversion(also a x^(3)process),and they open the door to exploitation of nondegenerate mixing and optical nonlinearities beyond the perturbative regime. | Nils Dessmann Nguyen H.Le Viktoria Eless Steven Chick Kamyar Saeedi Alberto Perez-Delgado Sergey G.Pavlov Alexander F.G.van der Meer Konstantin L.Litvinenko Ian Galbraith Nikolay V.Abrosimov Helge Riemann Carl R.Pidgeon Gabriel Aeppli Britta Redlich Benedict N.Murdin | 2021 | Light(Science & Applications)2021，10，5： | 0 |
| 3 | A universal route to efficient non-linear response via Thomson scattering in linear solids显示文摘Non-linear materials are cornerstones of modern optics and electronics.Strong dependence on the intrinsic properties of particular materials,however,inhibits the at-will extension of demanding non-linear effects,especially those second-order ones,to widely adopted centrosymmetric materials(for example,silicon)and te chnologically important burgeoning spectral domains(for example,terahertz frequencies).Here we introduce a universal route to efficient non-linear responses enabled by exciting non-linear Thomson scattering,a fundamental process in electrodynamics that was known to occur only in relativistic electrons in metamaterial composed of linear materials.Such a mechanism modulates the trajectory of charges,either intrinsically or extrinsically provided in solids,at twice the driving frequency,allowing second-harmonic generation at terahertz frequencies on crystalline silicon with extremely large non-linear susceptibility in our proof-of-concept experiments.By offering a substantially material-and frequency-independent platform,our approach opens new possibilities in the fields of on-demand non-linear optics,terahertz sources,strong field light-solid interactions and integrated photonic circuits. | Yongzheng Wen Flavio Giorgianni Igor Ilyakov Baogang Quan Sergey Kovalev Chen Wang Carlo Vicario Jan-Christoph Deinert Xiaoyu Xiong Joe Bailey Min Chen Alexey Ponomaryov Nilesh Awari Andrea Rovere Jingbo Sun Roberto Morandotti Luca Razzari Gabriel Aeppli Junjie Li Ji Zhou | 2023 | National Science Review2023，10，7： | 0 |
| 4 | 让芯片内部一览无余显示文摘烤蛋糕的时候,我们很难知道烤箱里何时才能达到我们想要的状态。对于微电子芯片来说亦如此,其中的风险甚至更高:工程师们如何确认芯片内部完全符合设计师的意图?半导体设计公司如何判断其知识产权是否被盗?更令人担忧的是,谁能确定其中没有秘密嵌入自毁开关或其他硬件木马? | Anthony F.J.Levi Gabriel Aeppli | 2022 | 科技纵览2022，，5： | 0 |
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