Known for his studies on organic solar cells, carbon nanotubes arrays and Förster resonance energy transfer, Gupta is a former Alexander von Humboldt Fellow.

The same year, he moved to Germany as an Alexander von Humboldt Fellow at Technische Universität Ilmenau to work on carbon nanotube and graphene where he stayed till 2004.

His next assignment was at Kyushu University as a visiting associate professor and he returned to India to take up the position of the deputy general manager at Hindustan Electro Graphite, Bhopal on the New Year's Day of 2008.

His stint at Bhopal lasted only a week and he went back to Kyushu University to resume his duties as a visiting faculty, a post he held for two months.

Gupta is known to have made notable contributions in the fields of organic solar cells, carbon nanotubes and Förster resonance energy transfer.