Dutta-Gupta Shourya, Martin O J F, Gupta S Dutta, Agarwal G S
Nanophotonics and Metrology Laboratory, Swiss Federal Institute of Technology (EPFL), Lausanne, Switzerland.
Opt Express. 2012 Jan 16;20(2):1330-6. doi: 10.1364/OE.20.001330.
We exploit the versatility provided by metal-dielectric composites to demonstrate controllable coherent perfect absorption (CPA) or anti-lasing in a slab of heterogeneous medium. The slab is illuminated by coherent light from both sides, at the same angle of incidence and the conditions required for CPA are investigated as a function of the different system parameters. Our calculations clearly elucidate the role of absorption as a necessary prerequisite for CPA. We further demonstrate the controllability of the CPA frequency to the extent of having the same at two distinct frequencies even in presence of dispersion, rendering the realization of anti-lasers more flexible.
我们利用金属-电介质复合材料所具备的多功能性，在非均匀介质平板中演示可控的相干完美吸收（CPA）或反激光效应。该平板从两侧以相同入射角由相干光照射，并研究了作为不同系统参数函数的CPA所需条件。我们的计算清楚地阐明了吸收作为CPA必要前提的作用。我们进一步证明了CPA频率的可控性，甚至在存在色散的情况下，能在两个不同频率处实现相同频率的可控性，从而使反激光的实现更加灵活。
