论文标题
3D Dirac半决器中有效产生极端的Terahertz谐波
Efficient generation of extreme terahertz harmonics in 3D Dirac semimetals
论文作者
论文摘要
对于下一代高速电子和频率梳子的创建，固态平台上Terahertz信号的频率乘法是高度追求的。具有适度输入强度的Terahertz信号的有效生成极端谐波的解决方案（最多可产生$ 31^{\ rm {st}} $谐波及以后），仍然难以捉摸。 Using fully nonperturbative simulations and complementary analytical theory, we show that 3D Dirac semimetals (DSMs) have enormous potential as compact sources of extreme terahertz harmonics, achieving energy conversion efficiencies beyond $10^{-5}$ at the $31^{\rm{st}}$ harmonic with input intensities on the order of $10$ MW/cm $^2 $，超过$ 10^5 $ $倍，比常规THZ高谐波生成系统低。我们的理论还揭示了3D DSM的非线性光学元件中的一个基本特征：一种独特的状态，在该方案中，高阶光学非线性消失，这是与2D DSM相比3D DSMS额外尺寸的直接结果。我们的发现应该为基于3D DSM的高频Terahertz光源和光电来开发有效平台的开发铺平道路。
Frequency multiplication of terahertz signals on a solid state platform is highly sought-after for the next generation of high-speed electronics and the creation of frequency combs. Solutions to efficiently generate extreme harmonics (up to the $31^{\rm{st}}$ harmonic and beyond) of a terahertz signal with modest input intensities, however, remain elusive. Using fully nonperturbative simulations and complementary analytical theory, we show that 3D Dirac semimetals (DSMs) have enormous potential as compact sources of extreme terahertz harmonics, achieving energy conversion efficiencies beyond $10^{-5}$ at the $31^{\rm{st}}$ harmonic with input intensities on the order of $10$ MW/cm$^2$, over $10^5$ times lower than in conventional THz high harmonic generation systems. Our theory also reveals a fundamental feature in the nonlinear optics of 3D DSMs: a distinctive regime where higher-order optical nonlinearity vanishes, arising as a direct result of the extra dimensionality in 3D DSMs compared to 2D DSMs. Our findings should pave the way to the development of efficient platforms for high-frequency terahertz light sources and optoelectronics based on 3D DSMs.
