A vertical cavity side transmission photon crystal surface wave laser and its design method

Abstract

The present invention provides a vertical cavity surface emitting photonic crystal surface wave laser and its design method, the design method includes following steps: step 1: choosing a luminescent material, determining the material refractive index, selecting structure model of the photonic crystal, determining the structure parameter; step 2. calculating the dispersion relation of the structure by the super cell technology and the plane wave expansion method, obtaining a surface model; step 3. planning a surface wave micro-cavity body, the surface layer of the cavity body has periodic undulation. The invention properly changes the surface layer structure of the photonic crystal, the surface layer or the adjacent layer of the surface layer has periodic undulation, so as to improve the emitting direction of the surface wave laser, changing to a vertical cavity surface emission from the original end emission, and the constant phase surface of the emission is very flat. The design of the invention has simple thinking, better integrity, widely applying range, designing the surface wave laser of different wave bands according to the luminescent characteristic of the different materials, especially designing light source device of the light communication wave band using semiconductor material having important value.

Description

technical field [0001] The invention provides a vertical cavity surface-emitting photonic crystal surface wave laser and a design method thereof, belonging to the technical fields of optoelectronics, optical communication, and the like. Background technique [0002] Photonic crystals are dielectric materials whose refractive index changes periodically in space, which can effectively control the propagation behavior of photons. Since E. Yablonovitch and S. John proposed this concept twenty years ago, people have paid extensive attention to the application of photonic crystals. Especially in the field of optical communication technology, photonic crystal devices such as photonic crystal fibers, microresonator lasers, filters, and integrated optical circuits have broad application prospects. The continuous improvement of semiconductor material microfabrication technology has greatly promoted the application of two-dimensional and even three-dimensional photonic crystal devices...

AI Technical Summary

Problems solved by technology

[0007] The surface wave lasers in the prior art belong to the end-emission type. Due to diffraction, the outgoing laser beam has a large divergence angle, so the directivity is poor and the equiphase plane is not flat.

Images