Continuous and dynamic spectral tuning of single nanowire lasers with subnanometer resolution using hydrostatic pressure

摘要: We report continuous, dynamic, reversible, and widely tunable lasing from 367 to 337 nm single GaN nanowires (NWs) by applying hydrostatic pressure up ∼7 GPa. The NW lasers, with heights of 4–5 μm diameters ∼140 nm, are fabricated using a lithographically defined two-step top-down technique. wavelength tuning is caused an increasing Γ direct bandgap precisely controllable subnanometer resolution. observed coefficients the NWs ∼40% larger compared microstructures same material or reported bulk values, revealing nanoscale-related effect that significantly enhances range this approach. This approach can be generally applied other semiconductor lasers potentially achieve full spectral coverage UV IR.