Design optimisation of metallic sub‐wavelength nanowire lasers

Abstract

Design optimisation of metal-clad cylindrical nanowire semiconductor lasers is undertaken. Attention is focused on structures having GaN as the material platform and utilising silver for the metal cladding. The lasing characteristics of such structures are explored using both the transfer matrix method and the finite element method for operating wavelengths from 330 to 830 nm and for metal cladding thicknesses in the range of 5-20 nm. Specifically, calculations are performed for the modal confinement factor, modal gain and device length across this wide parameter space. For representative structures, it is shown that lower-order TE and TM mode lasing can be supported in devices having cavity lengths of the order of 2 and 18 µm, respectively.

Analysis of the Direct Modulation Response of Nanowire Lasers

“…In previous work, the design of nano-laser has been explored where specific attention was given to determining the lasing condition [12]. In recent work design optimization of nano-laser was explored where it is predicted that ultra-short devices of length of the order 1 -2µm can support lasing [13][14]. It has been reported that small cavity sized lasers are capable of fast modulation speeds [15].…”