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We investigate strongly asymmetric self-assembled nanostructures with one ofdimensions reaching hundreds of nanometers. Close to the nanowire-like type ofconfinement, such objects are sometimes assigned as one-dimensional in nature.Here, we directly observe the spectrum of exciton excited states correspondingto longitudinal quantization. This is based on probing the optical transitionsvia polarization-resolved microphotoluminescence excitation ($\mu$PLE)measurement performed on single nanostructures combined with theoreticalcalculation of neutral and charged exciton optical properties. We successfullyprobe absorption-like spectra for individual bright states forming the excitonground-state fine structure, as well as for the negatively charged exciton.Confronting the calculated spectrum of excitonic absorption with $\mu$PLEtraces, we identify optical transitions involving states that contain carriersat various excited levels related to the longest dimension. Based oncross-polarized excitation-detection scheme, we show very well conserved spinconfiguration during orbital relaxation of the exciton from a number of excitedstates comparable to the quasi-resonant pumping via the optical phonon, and nopolarization memory for the trion, as theoretically expected.

Excited states of neutral and charged excitons in single strongly asymmetric InP-based nanostructures emitting in the telecom C band