Electronic control of coherence in a two-dimensional array of photonic crystal surface emitting lasers

Abstract

We demonstrate a semiconductor PCSEL array that uniquely combines an in-plane waveguide structure with nano-scale patterned PCSEL elements. This novel geometry allows two-dimensional electronically controllable coherent coupling of remote vertically emitting lasers. Mutual coherence of the PCSEL elements is verified through the demonstration of a two-dimensional Young’s Slits experiment. In addition to allowing the all-electronic control of the interference pattern, this type of device offers new routes to power and brightness scaling in semiconductor lasers, and opportunities for all-electronic beam steering.

Mode Control in Photonic Crystal Surface Emitting Lasers Through External Reflection

“…HERE have been significant recent developments in photonic crystal surface emitting lasers [1,2], with a particular focus on increasing output power through the development of individual lasers [3,4] through photonic crystal design and through coherent laser arrays [5]. Recently, triangular PC features (on a square lattice) have been exploited to realize watt-level output powers [6].…”

Modelling and Device Simulation of Photonic Crystal Surface Emitting Lasers Based on Modal Index Analysis

“…Recently, PCSELs with high single mode power, low divergence [8], wavelength and polarisation control [9], have been experimentally demonstrated. We have also showed that coherent 2D PCSEL arrays may be readily realised [10], [11], and that external in-plane feedback significantly modifies the operating characteristics of a PCSEL [12].…”

Modeling and Device Simulation of Photonic Crystal Surface Emitting Lasers Based on Modal Index Analysis

“…Recently, PCSELs with high single mode power, low divergence [8], wavelength and polarisation control [9], have been experimentally demonstrated. We have also showed that coherent 2D PCSEL arrays may be readily realised [10], [11], and that external in-plane feedback significantly modifies the operating characteristics of a PCSEL [12]. Whilst experimental works has flourished, the theoretical development of PCSELs has been a daunting task.…”