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12 papers · 2 filters
Enhancement of Two-photon Absorption in Quantum Wells for Extremely Nondegenerate Photon Pairs
Himansu S. Pattanaik, Matthew Reichert, Jacob B. Khurgin +2
We recently demonstrated orders of magnitude enhancement of two-photon absorption (2PA) in direct gap semiconductors due to intermediate state resonance enhancement for photons of…
3-D IR imaging with uncooled GaN photodiodes using nondegenerate two-photon absorption
Himansu S. Pattanaik, Matthew Reichert, David J. Hagan +1
We utilize the recently demonstrated orders of magnitude enhancement of extremely nondegenerate two-photon absorption in direct-gap semiconductor photodiodes to perform scanned ima…
Transition between self-focusing and self-defocusing in nonlocally nonlinear media
Guo Liang, Weiyi Hong, Yahong Hu +7
We reveal the relevance between the nonlocality and the focusing/defocusing states in nonlocally nonlinear media, and predict a novel phenomenon that the self-focusing/self-defocus…
Nonlinear reversal of PT symmetric phase transition in a system of coupled semiconductor micro-ring resonators
Absar U. Hassan, Hossein Hodaei, Mohammad-Ali Miri +2
A system of two coupled semiconductor-based resonators is studied when lasing around an exceptional point. We show that the presence of nonlinear saturation effects can have import…
Parity-time-symmetric coupled microring lasers operating around an exceptional point
Hossein Hodaei, M. Ali Miri, Absar Ul Hassan +4
The behavior of a parity-time (PT) symmetric coupled microring system is studied when operating in the vicinity of an exceptional point. Using the abrupt phase transition around th…
Ultrabroadband dispersive radiation by spatiotemporal oscillation of multimode waves
Logan G. Wright, Stefan Wabnitz, Demetrios N. Christodoulides +1
Despite the abundance and importance of three-dimensional systems, relatively little progress has been made on spatiotemporal nonlinear optical waves compared to time-only or space…