论文标题
电子振荡器驱动的第二次谐波生成的Terahertz光源在极端腔内
Terahertz Light Sources by Electronic-Oscillator-Driven Second Harmonic Generation in Extreme-Confinement Cavities
论文作者
论文摘要
相干光辐射的大多数来源都取决于人群反演驱动的激光振荡器。尽管它们在通信，医学，工业和其他领域的技术重要性，但访问0.1-10 THZ的光谱范围（“ Terahertz Gap”）仍然是一个挑战，这是一个用于从安全性到安全性和高速无线通信的应用程序频段。在这里，我们提出了一种通过在〜100 GHz范围内的技术成熟的电子振荡器（EOS）开始，在低损坏介电结构中通过有效的第二谐波产生（SHG）产生相干辐射。为了实现这一目标，我们引入了混合THZ波段介电腔设计，该设计结合了（1）高质量因子谐振器中的极端场浓度与（2）通过声子共振增强的（2）非线性材料。从理论上讲，我们可以预测$ 10^3 $％/w的转换效率，并有可能用输入功率1 W弥合THZ间隙。这种方法可实现有效的，级联的参数频率转换器，代表了新一代的光源，可扩展到MID-IR频谱及以后。
The majority of sources of coherent optical radiation rely on laser oscillators driven by population inversion. Despite their technological importance in communications, medicine, industry, and other fields, it remains a challenge to access the spectral range of 0.1-10 THz (the "terahertz gap"), a frequency band for applications ranging from spectroscopy to security and high-speed wireless communications. Here, we propose a way to produce coherent radiation spanning the THz gap by efficient second-harmonic generation (SHG) in low-loss dielectric structures, starting from technologically mature electronic oscillators (EOs) in the ~100 GHz range. To achieve this goal, we introduce hybrid THz-band dielectric cavity designs that combine (1) extreme field concentration in high-quality-factor resonators with (2) nonlinear materials enhanced by phonon resonances. We theoretically predict conversion efficiencies of >$10^3$ %/W and the potential to bridge the THz gap with 1 W of input power. This approach enables efficient, cascaded parametric frequency converters, representing a new generation of light sources extensible into the mid-IR spectrum and beyond.
