Article ID Journal Published Year Pages File Type
1543501 Photonics and Nanostructures - Fundamentals and Applications 2009 6 Pages PDF
Abstract

This paper presents a theoretical investigation of a laser oscillator and a laser switch, using a hetero-structure made of two one-dimensional photonic crystals with active materials and a period ratio of r (r > 1). Lasing is achieved near frequencies where the upper and lower band edges of the adjacent photonic crystals overlap (i.e., band edge resonance). Near the band edge resonance, two modes of laser oscillations are found; mode A – the threshold gain increases with r and mode B – the threshold gain decreases with r. By assuming a homogenously broadened gain medium at any particular r, only one of the two modes is able to participate in lasing. We also found the lasing mode is switchable upon a very small alteration in the refractive index of the materials present in the photonic crystal. The results of the paper will be very useful for designing a new class of tunable lasers and high sensitivity sensors.

Keywords
Related Topics
Physical Sciences and Engineering Materials Science Electronic, Optical and Magnetic Materials
Authors
, ,