TY - JOUR
T1 - Norton Equivalent Circuit for Pulsed Photoconductive Antennas-Part I
T2 - Theoretical Model
AU - Garufo, Alessandro
AU - Carluccio, Giorgio
AU - Llombart Juan, Nuria
AU - Neto, Andrea
PY - 2018
Y1 - 2018
N2 - A novel equivalent circuit for pulsed photoconductive sources is introduced for describing the coupling between the photoconductive gap and the antenna. The proposed circuit effectively describes the mechanism of feeding the antenna by the semiconductor when this latter is illuminated by a laser operating in a pulsed mode. Starting from the classical continuity equation, which models the free carriers' density with respect to the laser power pump and the semiconductor features, a Norton equivalent circuit in the frequency domain is derived. According to the Norton theorem, the equivalent source representation is decoupled from the antenna. In particular, for photoconductive antennas (PCAs), the Norton circuit takes into account of the electrical and optical properties of the semiconductor material, the features of the laser excitation, as well as the geometrical dimensions of the gap. The presence of the electrodes around the gap is part of the antenna and, therefore, it is taken into account in the antenna impedance. The proposed circuit allows the analysis of the coupling between the photoconductive source and the antenna, providing a tool to analyze and design PCAs.
AB - A novel equivalent circuit for pulsed photoconductive sources is introduced for describing the coupling between the photoconductive gap and the antenna. The proposed circuit effectively describes the mechanism of feeding the antenna by the semiconductor when this latter is illuminated by a laser operating in a pulsed mode. Starting from the classical continuity equation, which models the free carriers' density with respect to the laser power pump and the semiconductor features, a Norton equivalent circuit in the frequency domain is derived. According to the Norton theorem, the equivalent source representation is decoupled from the antenna. In particular, for photoconductive antennas (PCAs), the Norton circuit takes into account of the electrical and optical properties of the semiconductor material, the features of the laser excitation, as well as the geometrical dimensions of the gap. The presence of the electrodes around the gap is part of the antenna and, therefore, it is taken into account in the antenna impedance. The proposed circuit allows the analysis of the coupling between the photoconductive source and the antenna, providing a tool to analyze and design PCAs.
KW - Equivalent circuit
KW - photoconductivity
KW - terahertz (THz) photoconductive antenna (PCA)
KW - THz radiated power
KW - THz source
KW - THz technology
UR - http://www.scopus.com/inward/record.url?scp=85041413014&partnerID=8YFLogxK
UR - http://resolver.tudelft.nl/uuid:5c6fb2e6-5626-4468-8ba1-717f0e9a2a05
U2 - 10.1109/TAP.2018.2800524
DO - 10.1109/TAP.2018.2800524
M3 - Article
AN - SCOPUS:85041413014
SN - 0018-926X
VL - 66
SP - 1635
EP - 1645
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
IS - 4
ER -