The book presents information about Terahertz science, Terahertz
photodetectors and Terahertz Lasers. A special emphasis is given to room
temperature operation of long wavelength photodetectors based on novel
quantum dots (Centered Defect Spherical Quantum Dots). Moreover, a
complete analysis of systems based on Quantum Cascade structures to
detect far infrared wavelengths is provided. Finally, the book presents
Terahertz laser principles considering multi-color lasers in this range
of wavelengths. Written as a background for graduate students in the
Optics field.