Spontaneous emission of Bloch oscillation radiation from a single energy band

Abstract

In this study, we explored the possibility of enhanced spontaneous emission of radiation beyond the free space value by analyzing a semiconductor superlattice structure placed in a microcavity whose resonant modes were tuned to the Bloch frequency. In particular, we considered the spontaneous emission of Bloch radiation into the dominant mode of a rectangular waveguide. In the REPORT DOCUMENTATION PAGE Form Approved OMB NO. 0704-0188 Public Reporting burden for this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing the collection of information. Send comment regarding this burden estimates or any other aspect of this collection of information, including suggestions for reducing this burden, to Washington Headquarters Services, Directorate for information Operations and Reports,

Microcavity enhancement of spontaneous emission for Bloch oscillations

“…1 The theoretical analysis was fully quantum-mechanical, in that the radiation field was described as the free-space quantized electromagnetic field in the Coulomb gauge. Analysis of the probability amplitude, over integral multiples of the Bloch period, resulted in selection rules for photon emission in both photon frequency and wave vector, showing preferred transitions to the Wannier-Stark ladder levels.…”

Transverse magnetic mode along THz waveguides with biased superlattices

“…Theoretically, a negative differential conductivity (gain due to Bloch oscillations) appears for a wide miniband biased superlattice (BSL) with 2 Tbe B , where T is the tunnel matrix element between neighbouring wells, and e B is the energy corresponding to the Bloch frequency. This effect was studied from the 1970s [1,2] and proved in recent experiments [3,4]. A similar bearing of the THz response was informed for the BSL with tight-binding electronic states [5].…”

Enhanced Spontaneous Emission of Bloch Oscillation Radiation from a Single Energy Band

“…Specifically for the tightbinding energy band approximation, 18 one finds that v Ќ ͑K Ќ ͒ = v Ќ ͑K Ќ ͒. However, the second term on the righthand side of Eq.…”

“…It is clear that this condition for maximum growth establishes the selection rule 17,18 for the photon emission frequency ω q . Indeed, from the condition β q = 2πm, it follows from Eq.…”