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FDE simulations of a CsPbBr3 nanowire. (A) The six sustainable transverse modes for 540-nm light in a CsPbBr3 nanowire with width ≤500 nm. (B) The calculated effective refractive index for each mode as a function of nanowire width. Light is no longer confined to the nanowire once the effective refractive index reaches that of the quartz substrate (n = 1.46). These simulations suggest that a CsPbBr3 nanowire must have a width greater than ∼180 nm to act as an emission waveguide.
