Lasing Mode Control in ZnO Nanowires Coupled to TiO2 Nanopillars
Abstract
Nanowire lasers based on spectrally broad gain materials typically exhibit multimode emission, which limits their utility in applications requiring precisely defined spectral characteristics. In this study, we experimentally demonstrate the selective, narrow-band suppression of individual lasing modes in zinc oxide (ZnO) nanowire lasers through near-field coupling to titania (TiO2) nanopillars. Our study is based on photoluminescence spectroscopy in the lasing regime, which is complemented by finite-difference time-domain simulations. We show suppression of longitudinal nanowire lasing modes by their resonant coupling to the whispering gallery modes in nanopillars of suitable size. In addition to spectral selectivity of the coupling, we reveal two distinct coupling regimes based on polarization matching between whispering gallery modes and nanowire waveguide modes. These findings demonstrate a promising approach towards engineering the spectral emission properties of nanowire lasers through tailored photonic architectures.
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BibTeX
@misc{repp2026lasing,
title = {{Lasing Mode Control in ZnO Nanowires Coupled to TiO2 Nanopillars}},
author = {Daniel Repp and Francesco Vitale and Raja Hoffmann and Isabelle Staude and Thomas Siefke and Carsten Ronning and Thomas Pertsch},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.28375},
eprint = {2609.28375},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.28375},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Lasing Mode Control in ZnO Nanowires Coupled to TiO2 Nanopillars
AU - Daniel Repp
AU - Francesco Vitale
AU - Raja Hoffmann
AU - Isabelle Staude
AU - Thomas Siefke
AU - Carsten Ronning
AU - Thomas Pertsch
PY - 2026
DA - 2026/09/23
PB - arXiv
DO - 10.48550/arxiv.2609.28375
UR - https://arxiv.org/abs/2609.28375
AB - Nanowire lasers based on spectrally broad gain materials typically exhibit multimode emission, which limits their utility in applications requiring precisely defined spectral characteristics. In this study, we experimentally demonstrate the selective, narrow-band suppression of individual lasing modes in zinc oxide (ZnO) nanowire lasers through near-field coupling to titania (TiO2) nanopillars. Our study is based on photoluminescence spectroscopy in the lasing regime, which is complemented by finite-difference time-domain simulations. We show suppression of longitudinal nanowire lasing modes by their resonant coupling to the whispering gallery modes in nanopillars of suitable size. In addition to spectral selectivity of the coupling, we reveal two distinct coupling regimes based on polarization matching between whispering gallery modes and nanowire waveguide modes. These findings demonstrate a promising approach towards engineering the spectral emission properties of nanowire lasers through tailored photonic architectures.
ER -