Exciton-Population Inversion and Terahertz Gain in Semiconductors Excited to Resonance

Population inversion in optically pumped asymmetric quantum well terahertz lasers

Negative terahertz conductivity in disordered graphene bilayers with population inversion

Probing Exciton States in Hybrid Perovskite Semiconductors

Hybrid Organic-Inorganic Perovskites are a new generation of photovoltaic semiconductors that do not use scarce metals. Study of the viability of these materials involves detailed understanding of the various states an electron may go through in the material. Exciton states are bound excited electronic states just below the conduction band where the electron is essentially orbiting the “hole,” ...

Ultra-Compact Bidirectional Terahertz Switch Based on Resonance in Graphene Ring and Plate

In this paper, we present a switch based on coupling and resonance in thegraphene plate and rings operating at 10 THz. This structure consists of several layers ofHexagonal Boron Nitride (hBN), SiO2 and P+Si, such that graphene plates and rings areinside the hBN layer. The terahertz wave is incident from the upper part of the switchand Surface Plasmons (SPs) are excited ...

Population-inversion and gain estimates for a semiconductor TASER

We have investigated a solid–state design advanced (Soref et al. SPIE Proceedings, vol. 3795, 516 (1999)) to achieve Terahertz-Amplification-by-the-Stimulated-Emission-of-Radiation (TASER). The original design was based on lightto heavy-hole intersubband transitions in SiGe/Si heterostructures. This work adapts the design to electron intersubband transitions in the more readily available GaAs/G...