Fluorescence inhibition near spherical ENZ nanoparticles: competition between radiative and non-radiative processes

In this work, we aim to study numerically the emission decay rate of a hybrid system combining a quantum emitter (QE) and an epsilon-near-zero (ENZ) spherical nanoparticle (SNP). Inspired by the peculiar behavior of ENZ materials and their high potential in developing unusual abilities in controlling the emission properties of QE. More specifically the control of fluorescence inhibition, or the amplification of the lifetime of the excited state. This can naturally find applications in quantum information storage for optical quantum memories based on light-atom interaction which naturally benefit from storage time control. We demonstrate that the key process in limiting fluorescence inhibition is the competition between inhibition of fluorescence from the radiative processes and energy dissipation due to the non-radiative channels. Furthermore, we illustrate that this balance can be shifted to optimize inhibition as function of the QE position. The optimization happens via SNP size control, material composition, and λ_ENZ of the SNP. This detailed study introduces and paves the way for new research directions on the manipulation and optimization of QE properties in the vicinity of ENZ materials.

Surgical approach for duodenal diverticulum perforation: A case report

INTRODUCTION

Duodenal Diverticula is not uncommon and it is mostly found in the 2nd part of the duodenum. Despite the fact that it is mostly found incidentally, it can complicate however it rarely complicates by perforation. Treatment is indicated only in complicated cases and it is divided into conservative and surgical arms.

PRESENTATION OF CASE

It is a case of 78 years old Lebanese female that was diagnosed intra-operatively with a perforated duodenal diverticulum after presenting with post prandial abdominal pain, distention and pneumoperitoneum on imaging. Our case was consistent with previous reports where the diverticulum occurred in the second part of the duodenum. We opted for primary resection of the diverticulum and over-sewing. Moreover, patient had an uneventful post-operative course and progressed gradually to be discharged on day 10.

CONCLUSION

Our case aims to draw attention to a rare complication of duodenal diverticula and to widen the differential diagnosis of pneumoperitoneum thus concluding about the better treatment option. Previous reports show that proper management is still a controversial topic; however surgical approach is indicated in case of systemic signs.