GaSb-based material technology is an emerging technology platform for beyond-telecom optoelectronic devices that open and enable new application opportunities. The fundamental cornerstones of the technology attractiveness are: 1) accessible spectral range 1.5 – 4 µm, which includes strong and specific combination and fundamental absorption bands of molecular ro-vibrational transitions, allowing for spectroscopic sensing; 2) efficient room-temperature operation of light sources and detectors 3) high-volume scalable manufacturing technology; 4) possibility to integrate with SOI-based photonic integrated circuits. Spectral range, spanning beyond telecom wavelengths, has a huge potential for various optical sensing applications by means of tunable laser absorption spectroscopy due to existence of strong ro-vibrational molecular absorption bands. Particularly interesting is the range from 1.5 to 2.5 µm, where strong first-overtone and combination absorption bands of lactates, ethanol, glucose, urea and other important bio-molecules appear and light is still able to penetrate through skin and reach the interstitial fluid and first dense capillary network. This opens an opportunity for non-invasive blood-metabolite monitoring by optical means for a plurality of purposes, especially in the health and wellness market segments. For example, lactate concentration rise in human blood is an early predictor of sepsis, which is responsible for 1 out of 5 hospital deaths globally, moreover lactate level dynamics in blood during sports activities provide information of athlete’s fatigue, overtraining and physical form, thus is of great interest for professional and amateur athletes. Glucose is extremely critical for type-I and type-II diabetes management, however also important for general diet monitoring and customization. Finally, ethanol (blood alcohol) is also of great interest either for drinking-and-working (driving) prevention. In addition to blood metabolites, measuring concentration in real time in fluids carries is of particular interest in industrial and agricultural sectors. For example, real-time milk analysis shows great application potential. Here, the spectral range allows to measure milk fat content, protein content, urea content, etc., which, in turn can be used as a tool for monitoring and diagnosing herd immunity in real-time and helping increase or, at least sustain, milk production efficiency. Moreover, one can very easily apply spectroscopic sensing techniques in plastic sorting industry. The spectral range, accessible by antimonide-based devices, allows non-destructive, real-time sensing of different plastic types and can be easily implemented in industrial sorting lines.
Kristijonas is a co-founder of Brolis company group and oversees III-V device and epitaxy activities He received the B.S. degree in electrical engineering in 2007 from Vilnius University, Vilnius, Lithuania, the M.Sc. degree in physics in 2009 from the Royal Institute of Technology, Stockholm, Sweden, and completed PhD studies in the field of semiconductor technology in 2012 from the Walter Schottky Institute, TU Munich, Munich, Germany. In 2011, he co-founded Brolis Semiconductors, Vilnius, Lithuania, where he currently heads the epitaxial growth activities. He has authored or coauthored more than 60 papers in scientific peer-reviewed journals and conference proceedings, two granted U.S. patents, and seventeen pending patent applications. He was awarded with the Order of Merit to Lithuania Knights Cross in 2017, the Medal for Distinguished Service from Lithuanian Special Operation Forces in 2018, and the Medal for Merit of Lithuania's Riflemen's Union in 2015.