Burgess Ian B, Zhang Yinan, McCutcheon Murray W, Rodriguez Alejandro W, Bravo-Abad Jorge, Johnson Steven G, Loncar Marko
School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.
Opt Express. 2009 Oct 26;17(22):20099-108. doi: 10.1364/OE.17.020099.
We propose a scheme for efficient cavity-enhanced nonlinear THz generation via difference-frequency generation (DFG) processes using a triply resonant system based on photonic crystal cavities. We show that high nonlinear overlap can be achieved by coupling a THz cavity to a doubly-resonant, dual-polarization near-infrared (e.g. telecom band) photonic-crystal nanobeam cavity, allowing the mixing of three mutually orthogonal fundamental cavity modes through a chi((2)) nonlinearity. We demonstrate through coupled-mode theory that complete depletion of the pump frequency - i.e., quantum-limited conversion - is possible. We show that the output power at the point of optimal total conversion efficiency is adjustable by varying the mode quality (Q) factors.
我们提出了一种通过基于光子晶体腔的三共振系统利用差频产生（DFG）过程实现高效腔增强非线性太赫兹产生的方案。我们表明，通过将太赫兹腔耦合到双共振、双偏振近红外（例如电信频段）光子晶体纳米束腔，可以实现高非线性重叠，从而允许通过χ(2)非线性混合三个相互正交的基本腔模。我们通过耦合模理论证明了泵浦频率的完全耗尽——即量子极限转换——是可能的。我们表明，通过改变模式品质因数（Q），可以调节总转换效率最佳点处的输出功率。
