Prof. Sushil Mujumdar (Tata Institute for Fundamental Research)
For a long time, investigations of light transport in disordered media retraced the trail of mesoscopic studies in electronic systems, punctuated by observations such as light diffusion and the metal-insulator transition for light. The addition of optical gain into the disordered medium, however, led to a series of unexpected observations that initiated an idea of optical materials titled, rather fancifully, 'random lasers'. In this talk, I will first explain the term random lasers, and then present a report of our own contributions in frequency and intensity statistics thereof. The former study has revealed interesting facets of bandedge and bandgap state lasing, and has led to the observation of Anderson localization with gain and the temporal statistics of Anderson localized lasing modes[1]. The latter study provided evidence of the manifestation of an exotic statistical process called the truncated Levy flight in random lasers, which enabled us to completely describe the intensity behavior on a single unique platform[2]. References: [1] A K Tiwari and S Mujumdar, Physical Review Letters, 111, 233903 (2013) [2] R Uppu and S Mujumdar, Physical Review Letters, 114, 183903 (2015)
Ort: ENC-D 308, Emmy-Noether-Campus
Veranstalter: Universität Siegen, Fakultät IV, Department Physik