Department of Physical Electronics, Fleischman Faculty of Engineering, Tel-Aviv University, Tel-Aviv 69978, Israel.
Opt Lett. 2011 May 1;36(9):1584-6. doi: 10.1364/OL.36.001584.
Whereas periodic gratings enable us to couple light into a surface plasmon polariton only at a specific angle and wavelength, we show here that quasiperiodic gratings enable the coupling of light at multiple wavelengths and angles. The quasiperiodic grating can be designed in a systematic manner using the dual-grid method, thereby enabling us to control the coupling strength and grating dimensions. We verified the method experimentally by efficiently coupling light into a surface plasmon from several different illumination angles using a single quasiperiodic grating.
虽然周期性光栅只能在特定的角度和波长下将光耦合到表面等离激元中，但我们在这里展示了准周期光栅可以在多个波长和角度下实现光的耦合。准周期光栅可以使用双栅格方法以系统的方式进行设计，从而能够控制耦合强度和光栅尺寸。我们通过使用单个准周期光栅从几个不同的照明角度有效地将光耦合到表面等离激元中，从而在实验上验证了该方法。
