“…Traditional photoelectric detectors include photodiodes (Melchior 1972(Melchior , 1977, phototransistors (Jayson and Knight 1976;DeLaMoneda et al 1971;Forbes et al 1976), avalanche photodiodes (Johnson 1965;Carrano 2000), PiN diodes (Lee and Sze 1970;Singh et al 2002), and metal-semiconductor-metal photodetectors (Chen et al 2001). Although different in structures and performances, all the traditional photoelectric detectors have a common characteristic: they can generate only a constant electric signal when the illuminance is constant, implying that the circuitry followed the photoelectric detectors must deal with DC signals.…”