Investigation of the resonant lengths of a slot nanoantenna and infrared dipole antennas

Following the analogy of radio frequency slot antenna and its complementary dipole, we propose the implementation of a slot nanoantenna (SNA) and the resonant lengths of infrared dipole antennas investigated. Using finite-difference time-domain (FDTD) method, we investigate the electromagnetic (EM) properties of a SNA. It is found that the resonance of the SNA is influenced by its slot length; for the increasing slot length, resonant frequency decreases whereas the sharpness of resonance increases. Besides, the resonance of the SNA is found sensitive to the thickness of metal film, when the latter is smaller than the skin depth. In infrared dipole antennas airdeferent efficiencies of power side and substrate-side illumination exhibit identical resonant antenna lengths, but collection. Finally, an antenna response is measured at visible frequencies.

Keywords:

“nanoantenna” , “ infrared dipole antennas” , “ resonant” , “ visible frequencies