Electrically pumped Photonic Crystal Quantum Cascade (QC) Laser combines photonic bandgap engineering to achieve vertical emission (left) with electronic band engineering to design wavelength (center). Finished device is shown on the right. This approach results in robust mid-IR (λ = 4 - 24 μm) injection QC laser technology, which creates new functionalities in a broad spectral region from the mid-IR to the far-IR. Holey structures create new opportunities in chem-bio sensing, microcavity physics and nonlinear optics.