# Bangladeshi Scientist Promit Ghosh and Team Break 165-Year-Old Scientific Law

> Bangladeshi scientist Promit Ghosh, a BUET alumnus, has defied Kirchhoff’s 165-year-old law of thermal radiation. At Penn State, his team developed a 2μm metamaterial that emits more heat than it absorbs. Published in *…

Published: 2026-09-17 · Desk: Latest · Source: Penn State University

In a groundbreaking scientific achievement, Bangladeshi researcher Promit Ghosh — a graduate of BUET’s Mechanical Engineering Department — has successfully challenged Kirchhoff’s Law of Thermal Radiation, a foundational principle in physics that stood unchallenged for 165 years.

Ghosh, currently conducting research at Pennsylvania State University (Penn State), published his findings in the prestigious journal Physical Review Letters. The discovery has captured global attention, drawing praise from top scientific communities and international media outlets.

Together with his research team, Ghosh developed an ultra-thin metamaterial — only 2 micrometers thick — composed of five semiconductor layers. Unlike conventional materials, this innovative structure emits more thermal radiation than it absorbs, directly contradicting Kirchhoff’s classical law, which states that in thermal equilibrium, absorption and emission must be equal.

To verify this phenomenon, the team created a custom device called the Magnetic Thermal Spectrophotometer, using it alongside a powerful magnetic field to measure thermal radiation with exceptional precision. Their experiments confirmed, for the first time, the existence of a material that breaks the symmetry of absorption and emission.

This pioneering discovery holds immense potential for transformative applications, including next-generation solar panels, infrared sensors, thermal batteries, and advanced heat management systems. Experts suggest it could even pave the way for technologies previously considered science fiction.

Promit Ghosh’s remarkable contribution brings pride to Bangladesh and serves as a powerful source of inspiration for aspiring scientists at home and around the world — showcasing the global impact of Bangladeshi talent in cutting-edge science and engineering.

Original reporting: https://www.psu.edu/news/engineering/story/rewriting-scientific-law-unlock-potential-energy-sensing-and-more
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