Choi Hyeongrak, Heuck Mikkel, Englund Dirk
Research Laboratory of Electronics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Department of Photonics Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark.
Phys Rev Lett. 2017 Jun 2;118(22):223605. doi: 10.1103/PhysRevLett.118.223605. Epub 2017 May 30.
We propose a photonic crystal nanocavity design with self-similar electromagnetic boundary conditions, achieving ultrasmall mode volume (V_{eff}). The electric energy density of a cavity mode can be maximized in the air or dielectric region, depending on the choice of boundary conditions. We illustrate the design concept with a silicon-air one-dimensional photon crystal cavity that reaches an ultrasmall mode volume of V_{eff}∼7.01×10^{-5}λ^{3} at λ∼1550 nm. We show that the extreme light concentration in our design can enable ultrastrong Kerr nonlinearities, even at the single-photon level. These features open new directions in cavity quantum electrodynamics, spectroscopy, and quantum nonlinear optics.
我们提出了一种具有自相似电磁边界条件的光子晶体纳米腔设计，实现了超小模式体积（Veff）。根据边界条件的选择，腔模的电能密度可以在空气或电介质区域达到最大化。我们用一个硅-空气一维光子晶体腔来说明设计概念，该腔在λ ∼ 1550 nm时达到了Veff ∼ 7.01×10-5λ3的超小模式体积。我们表明，即使在单光子水平下，我们设计中的极端光场集中也能够实现超强克尔非线性。这些特性为腔量子电动力学、光谱学和量子非线性光学开辟了新的方向。
