His post-doctoral studies were at the Photosciences and Photonics Group of the Manapurathu Verghese George at the National Institute for Interdisciplinary Science and Technology (NIIST) as a research associate.
[7] The research of Thomas has been focused on photoresponsive nanomaterials and his work is reported to have assisted in widening the understanding about their applications.
[8] He also worked on self-organization of molecules on surfaces and has developed methodologies for modulating molecular organization through the introduction of functional groups.
[9] Thus, he developed a number of near-infrared absorbing sensitizers which are relevant in biological imaging and optical data storage applications.
[16] Thomas received the Bronze Medal of the Chemical Research Society of India in 2004[17] and the MRSI Medal of the Material Research Society of India in 2005; MRSI would honor him again in 2015 with the MRSI-ICSC Super Conductivity and Materials Science Prize.