Colorimetric Phosphate Detection Using Organic DFB Laser Based Absorption Spectroscopy

Micromachines

Jörg Knyrim¹  Thilo Pudleiner¹  Elias Sutter¹  Christian Karnutsch¹ 

[1] Institute for Sensor and Information Systems, Research Group Integrated Optofluidics and Nanophotonics (IONAS), University of Applied Sciences Karlsruhe, 76133 Karlsruhe, Germany;

关键词: organic laser;    DFB laser;    optofluidics;    polymer laser;    absorption spectroscopy;    phosphate;   

DOI  :  10.3390/mi12121492

来源: DOAJ

【 摘 要 】

A novel compact laser absorption spectrometer is developed for colorimetric detection. We demonstrate the realization of the system as well as example measurements of phosphate in water samples based on the malachite green (MG) method. A phosphate concentration range of $1 \mathrm{mg}/\mathrm{L}$ to $31.25 \mathsf{\mu }\mathrm{g}/\mathrm{L}$ (which corresponds to a molar concentration range of $10.5 \mathsf{\mu }\mathrm{mol}/\mathrm{L}$ to $329 \mathrm{nmol}/\mathrm{L}$) is investigated. This photometer demonstrates the ease of integration of organic distributed feedback (DFB) lasers and their miniaturizability, leading the way toward optofluidic on-chip absorption spectrometers. We constructed an optically pumped organic second-order DFB laser on a transparent substrate, including a transparent encapsulation layer, to have access to both emission directions of the surface-emitting laser. Using the two different surface emission directions of the laser resonator allows monitoring of the emitted light intensity without using additional optical elements. Based on these advances, it is possible to miniaturize the measurement setup of a laser absorption spectrometer and to measure analytes, such as phosphate.

【 授权许可】

Unknown