On-Chip ATR Sensor (λ = 3.4 μm) Based on InAsSbP/InAs Double Heterostructure for the Determination of Ethanol Concentration in Aqueous Solutions

• Published in: Optics and spectroscopy Vol. 131; no. 1; pp. 31 - 37
• Main Authors: Karandashev, S. A., Klimov, A. A., Lukhmyrina, T. S., Matveev, B. A., Remennyi, M. A., Usikova, A. A.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 2023; Springer Nature B.V
• Subjects: Algorithms; Aqueous solutions; Current voltage characteristics; Ethanol; Heterostructures; Indium arsenide antimonide phosphide; Indium arsenides; Lasers; Light emitting diodes; Mesas; Optical Devices; Optics; Photodiodes; Photoelectricity; Photonics; Physics; Physics and Astronomy; Substrates; Waveguides; ATR sensor; optical sensors; LEDs in the mid-IR range; photodiodes in the mid-IR range; on-chip sensor
• ISSN: 0030-400X; 1562-6911
• DOI: 10.1134/S0030400X23030116

We discuss photoelectrical properties of an on-chip attenuated total reflection (ATR) sensor for the ethanol concentration measurements in an aqueous solution. The on-chip sensor/microchip was made from a
p
-InAsSbP/
n
-InAs monolithic double heterostructure with three mesas/individual diodes grown on a single
n
+
-InAs substrate/waveguide. Two heterostructure diodes were used as photodiodes, while the third one—as a LED. The ethanol concentration was measured via an algorithm based on analysis of the I–V characteristic parameters of a photodiode and the L–I characteristics of the LED.