Technological advancements have driven the humanity for the past five decades. In many of these technological advances, computational electro magnetics has played a major role. From the design of aeroplanes down to consumer electronics, the field of computational electromagnetics has been growing steadily in terms of maturity, complexity, as well as performance. However, innovation does not seem to slow down anytime soon. The dimension of technological devices continues to shrink down to nano scale. This also results in an ongoing research in the field of nano photonics to bring the speed of light down to the nano scale regime and integrate them with electronics. All these new advances demand a new and further development of current techniques for computational electromagnetics. In this paper, we will present some of our works that tackles the issue of computational electromagnetics as it is applied to nano scale devices.