Radiation emission from wrinkled SiGe/SiGe nanostructure

Fedorchenko, A. I.; Cheng, H. H.; Sun, G.; Soref, R. A.
March 2010
Applied Physics Letters;3/15/2010, Vol. 96 Issue 11, p113104
Academic Journal
Semiconductor optical emitters radiate light via band-to-band optical transitions. Here, a different mechanism of radiation emission, which is not related to the energy band of the materials, is proposed. In the case of carriers traveling along a sinusoidal trajectory through a wrinkled nanostructure, radiation was emitted via changes in their velocity in a manner analogous to synchrotron radiation. The radiated frequency of wrinkled SiGe/SiGe nanostructure was found to cover a wide spectrum with radiation power levels of the order of submilliwatts. Thus, this nanostructure can be used as a Si-based optical emitter and it will enable the integration of optoelectronic devices on a wafer.


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