Professor Dagenais’s activities on energy center on solar energy conversion and lighting. In the area of solar energy, he fabricates different photovoltaic cells. In particular, he uses light to generate electron-hole pairs in the following semiconductors GaAs/AlGaAs, GaN/InGaN, and copper-indium-gallium-selenide (CIGS) and his research focuses on optimizing the current generation in these devices. He also uses mid-IR light in a new way for scavenging energy. Light is used as a wave to excite a nanoantenna directly connected to a tunneling diode that effectively rectifies the incident electromagnetic wave and generate energy. Professor Dagenais also works on making more efficient light sources. More than 20 % of the electricity consumed in the USA is used for lighting applications. Dr. Dagenais is studying approaches for making solid state sources based on the InGaN/GaN material system more efficient. Ultimately, solid state lighting will lead to the realization of the most efficient light sources and large savings in energy.