Highly Sensitive Singlet Oxygen Spectroscopic System Using InGaAs PIN Photodiode

Abstract

The spectrum of 1 O 2 was measured by the InGaAs photodiode for an optical communication system with charge integration amplifier (InGaAs-CIA). The photo-excited current is charged in photodiode junction capacitance itself. The current is changed to the voltage about 10 12 times without feedback resistance. The minimum detectable power of InGaAs CIA system with liquid nitrogen was achieved 0.1 fW of 10 sec integration time at the wavelength of 1.28 μm. The optical band pass filter-based system for ultra-low-level light detection was succeeded in spectrum measurement of 1 O 2 by 13-LOOH with cytochrome c. The 8 channel InGaAs-CIA array system enables to achieve optical multichannel detection for ultra-low level light at 10 −13 W from 10 −15 W level in the near-infrared region. The optical resolution was about 200 nm by 1 channel. The spectrum of 1 O 2 by mixing NaOCl and H 2 O 2 was demonstrated. The shape of spectrum by 1 O 2 was matched to that of measured by the spectrometer. The system was succeeded in instantaneous 1 O 2 spectrum measurement without moving the wavelength dispersion device. The generation of 1 O 2 by photo-excited Rose Bengal was fabricated to develop food antioxidant chemistry or source reagent of cosmetic product. The system uses super luminosity LED for excitation light source and InGaAs CIA. The 1 O 2 generation will be controlled by the InGaAs-CIA monitoring system. The system will be used in the chemical plant of primary material production.

Singlet oxygen luminescence detector based on low-cost InGaAs avalanche photodiode

“…On the other hand, advances in semiconductor technology have led to the emergence of sensitive detectors, which can be used for the detection of 1 O 2 luminescence. Mizumoto et al [10] used InGaAs photodiode cooled to 77 K with charge integration system. Boso et al [11] described the negative-feedback avalanche diode operating in single photon mode, capable of the 1 O 2 luminescence detection in biological medium.…”