In my talk, I will present our most recent results on advances in photonic THz generation and detection by using of nanosized structures. The talk includes two different approaches to nanostructure involvement: first, I will review the results on THz generation in InAs/GaAs quantum dot based photoconductive antennas, their strenghts and perspectives. Then, I will describe the advantages of Hybrid metallic photoconductive antennas that include both microsized THz antenna structure and optical nanoantennas, over conventional ones.