Optical Nanostructures Laboratory, Columbia University, New York, New York 10027, USA.
Opt Lett. 2012 Feb 15;37(4):665-7. doi: 10.1364/OL.37.000665.
We demonstrate chip-scale flat-top filters at near-IR wavelengths using negative index photonic crystal based Mach-Zehnder interferometers. Supported by full three-dimensional numerical simulations, we experimentally demonstrate a new approach for engineering high-pass, low-pass, bandpass, and band-reject filters, based on designing the photonic band diagram both within the bandgap frequency region and away from it. We further show that our approach can be used to design filters that have tunable multilevel response for different sections of the spectrum and for different polarizations. This configuration enables deterministic control of the bandwidth and the rejection ratio of filters for integrated photonic circuits.
我们使用基于负折射率光子晶体的马赫-曾德尔干涉仪在近红外波长演示了片上平顶滤波器。通过全三维数值模拟的支持，我们实验证明了一种新的方法，用于在带隙频率区域内和之外设计光子带图，从而设计高通、低通、带通和带阻滤波器。我们进一步表明，我们的方法可用于设计具有针对光谱不同部分和不同偏振的可调谐多级响应的滤波器。这种配置能够实现对集成光子电路滤波器的带宽和抑制比的确定性控制。
