Vijayakumar Balakrishnan

Vijayakumar Balakrishnan works on nonlinear optics and light-matter interaction in nanostructured materials. His record is in optical limiting: rare-earth and transition-metal doped phosphates, tungstates and carbon-nitride heterojunctions, and the mechanisms behind two-photon absorption, optical Kerr nonlinearity and ultrafast photo-excited carrier dynamics. He trained in the optical-nonlimiting group of Prof. T. C. S. Girisun at the Indian Institute of Technology Madras, and his work on defect-state enhanced third-order nonlinearity in Bi-doped MnWO4 and on Zn-doped Bi2WO6 showed how structural distortion and dopant energy levels set the limiting threshold. At the Sustainable Photonic Materials Lab he works on the light-matter side of the same question: what a nonlinear response does inside a confined optical field, and how a micro-resonator changes it. He is the co-author, with the lab's principal investigator, of the 2026 paper on metal-free single-component white-light emission and visible-to-NIR whispering-gallery micro-emitters published in RSC Applied Interfaces.