The Terahertz Devices and Intersubband Nanostructures Laboratory is focused on the study of device physics and development of novel devices at the intersection of the nanoscale and terahertz frequency range. At sufficiently small dimensions, the wave nature of electrons becomes relevant to their operation, and the rapidly evolving tools of nanoscale fabrication can be used to engineer the quantum mechanical properties of devices to create new functionality. This is epitomized by the development of the quantum cascade laser, a intra-band semiconductor laser for which the wavelength of light is not determined not by the bandgap, but rather is chosen by engineering electronic states in coupled 2D quantum wells - i.e. by creating "artificial molecules." The tools of nanotechnology and micromachining will be essential in fully exploiting the terahertz frequency range, a little used region of the spectrum that lies between the microwave and infrared, and offers great promise for chemical and biological sensing, security screening and explosive and drug detection, astrophysics, medical imaging, industrial inspection, and short-range high-bandwidth communications. Our goal is to develop terahertz technology, as well as extending the concepts of heterostructure bandgap engineering to lower dimensional semiconductor such as quantum wires and dots.