Title :
Design and characterization of evanescently-coupled photodiodes for 1.3 μm wavelength
Author :
Lee, Eun S. ; Lee, I.-M. ; Kim, N.J. ; Park, J.-W. ; Han, S.-P. ; Park, K.H.
Author_Institution :
THz Photonics Creative Res. Center, ETRI, Daejeon, South Korea
Abstract :
The evanescently coupled waveguide photodiode (ECPD) has been fabricated and used for the generation of continuous-wave (CW) terahertz (THz) field at a 1.3 μm wavelength. We designed a matching layer to evanescently couple the optical beam from the base waveguide to the active region so as to get a high responsivity, 0.36 A/W. We also measured CW THz photocurrent at 350 GHz using log-periodic antenna-integrated ECPD as emitting photomixer. We get the signal-to-noise ratio of about 60dB.
Keywords :
integrated optics; optical design techniques; optical testing; optical waveguides; photoconductivity; photodiodes; photoemission; CW THz photocurrent; active region; base waveguide; continuous-wave terahertz field generation; emitting photomixer; evanescently coupled waveguide photodiode characterization; evanescently coupled waveguide photodiode design; frequency 350 GHz; log-periodic antenna-integrated ECPD; matching layer; noise figure 60 dB; optical beam; signal-to-noise ratio; wavelength 1.3 mum; Antenna measurements; High-speed optical techniques; Optical reflection; Optical saturation; Optical surface waves; Optical waveguides; Photodiodes;
Conference_Titel :
Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2014 39th International Conference on
Conference_Location :
Tucson, AZ
DOI :
10.1109/IRMMW-THz.2014.6956530
