Skip to content
DraconiticResearch
Search Sources API
181,686 studies31 sourcesUpdated 51 min ago
PreprintarXiv licencearXiv

Observation of Size-dependent Optical Modes and Confinement in Fin Cavities using Angle-Resolved Cathodoluminescence

  • Kiana Malmir
  • Jonathan Lee
  • Douglas Cameron
  • Babak Nikoobakht
Open at sourcePDFDOICite

Abstract

We observe novel optical fringes and emission coherence in laterally formed semiconductor fins using wavelength- and angle-resolved cathodoluminescence (WARCL). These findings demonstrate that cavity mode and emission confinement are directly governed by cavity geometry including cavity dimensions, facet angles, and orientation. In flat fins narrowing the width from 3000 nm to 200 nm sharpens fringe intensity, indicating stronger mode confinement and increased coherence. Finite-difference time-domain (FDTD) simulations confirm that the observed fringes originate from internal reflections among the fin facets, consistent with a Fabry-Pérot (FP) cavity model where the cavity length determines the fringe spacing. FDTD also reveals a transition from multi-mode to single-longitudinal-mode behavior in 200-nm fins, consistent with experimentally observed fringe narrowing. Increasing fin length from 10 μm to 30 μm compresses fringe spacing via longer round-trip paths. Conversely, tilting the fin end-facet from 90° to 45° reduces the effective light path length, increasing the incoherent optical emission. Remarkably, this loss can be offset by adjusting the fin length-to-height ratio. Results suggest WARCL is a robust in-situ method for direct characterization of individual dielectric nanocavities, mapping their modal profiles and light directionality as a function of geometry for custom design of nanoscale optical sources and waveguides.

Related

  1. Gearbox cavities: Ultrahigh wave confinement via broken rotational symmetry
    Alessio Amaolo, Sean Molesky, Alejandro W. Rodriguez +3
    arXivPreprintarXiv licenceFull textOptics & photonicsarXiv
  2. Time-resolved observation of magnon splitting into vortex gyration and Floquet spin waves
    T. Devolder, R. Lopes Seeger, C. Heins +9
    Physical Review AppliedPeer-reviewedCC BY 4.0Full text1 citedAtomic, molecular & optical physicsHAL
  3. Field-resolved observation and quantification of the instantaneous Kerr response in semiconductors
    Haifeng Lin, Hannes Kempf, Hinduja Bhuvanendran +3
    arXivPreprintCC BY 4.0Full textCondensed matterOptics & photonicsarXiv
  4. Direct observation of thermal spin depolarization in a type IB half-metal NiCo2O4 by spin-resolved photoemission
    Hirokazu Fujiwara, Tomoki Higashikawa, Enda Xiao +9
    Physical Review ResearchPeer-reviewedCC BY 4.0Condensed matterAPSCrossref
  5. Time- and Frequency-Resolved Observation of Inverse Orbital Hall Effect in Gallium Nitride via Terahertz Polarimetry
    Kota Aikyo, Tomohiro Fujimoto, Ami Mi Shirai +6
    arXivPreprintCC BY 4.0Full textCondensed matterarXiv

Cite

BibTeXRIS
BibTeX
@misc{malmir2026observation,
  title = {{Observation of Size-dependent Optical Modes and Confinement in Fin Cavities using Angle-Resolved Cathodoluminescence}},
  author = {Kiana Malmir and Jonathan Lee and Douglas Cameron and Babak Nikoobakht},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.29782},
  eprint = {2610.29782},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.29782},
}
RIS
TY  - UNPB
TI  - Observation of Size-dependent Optical Modes and Confinement in Fin Cavities using Angle-Resolved Cathodoluminescence
AU  - Kiana Malmir
AU  - Jonathan Lee
AU  - Douglas Cameron
AU  - Babak Nikoobakht
PY  - 2026
DA  - 2026/10/21
PB  - arXiv
DO  - 10.48550/arxiv.2610.29782
UR  - https://arxiv.org/abs/2610.29782
AB  - We observe novel optical fringes and emission coherence in laterally formed semiconductor fins using wavelength- and angle-resolved cathodoluminescence (WARCL). These findings demonstrate that cavity mode and emission confinement are directly governed by cavity geometry including cavity dimensions, facet angles, and orientation. In flat fins narrowing the width from 3000 nm to 200 nm sharpens fringe intensity, indicating stronger mode confinement and increased coherence. Finite-difference time-domain (FDTD) simulations confirm that the observed fringes originate from internal reflections among the fin facets, consistent with a Fabry-Pérot (FP) cavity model where the cavity length determines the fringe spacing. FDTD also reveals a transition from multi-mode to single-longitudinal-mode behavior in 200-nm fins, consistent with experimentally observed fringe narrowing. Increasing fin length from 10 μm to 30 μm compresses fringe spacing via longer round-trip paths. Conversely, tilting the fin end-facet from 90° to 45° reduces the effective light path length, increasing the incoherent optical emission. Remarkably, this loss can be offset by adjusting the fin length-to-height ratio. Results suggest WARCL is a robust in-situ method for direct characterization of individual dielectric nanocavities, mapping their modal profiles and light directionality as a function of geometry for custom design of nanoscale optical sources and waveguides.
ER  -