Up/down-conversion of infrared light by few-layer graphene polytypes
Abstract
Optical nonlinearity of materials with broken inversion symmetry enables two-photon processes where an incoming pair of photons can generate an up-converted photon with the combined frequency, or a high-energy photon can be split into a correlated pair of down-converted photons. Here, we identify few-layer graphene films that offer up/down-conversion capability in the infrared spectral range. For mixed stacking tetralayers (ABCB), which are non-centrosymmetric 2D crystals, we find highly efficient nearly resonant up/down-conversion of [ω1,ω2] photon pairs into/from a photon with $0.7eV<Ω=ω_1+ω_2<1.1$eV. We also note that a pronounced second-order nonlinearity in the spectral range of $0.7eV<Ω<0.9$eV can be promoted in rhombohedral tri- and tetralayers by asymmetrical encapsulation. Potentially, for fibers coated with few-layer graphene, this opens the door for ``in fiber" production of photon pairs with correlated polarizations.
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BibTeX
@misc{sarsfield2026updownconversion,
title = {{Up/down-conversion of infrared light by few-layer graphene polytypes}},
author = {Patrick Johansen Sarsfield and Takaaki V. Joya and Takuto Kawakami and Mikito Koshino and Vladimir Falko},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.15866},
eprint = {2609.15866},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.15866},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Up/down-conversion of infrared light by few-layer graphene polytypes
AU - Patrick Johansen Sarsfield
AU - Takaaki V. Joya
AU - Takuto Kawakami
AU - Mikito Koshino
AU - Vladimir Falko
PY - 2026
DA - 2026/09/14
PB - arXiv
DO - 10.48550/arxiv.2609.15866
UR - https://arxiv.org/abs/2609.15866
AB - Optical nonlinearity of materials with broken inversion symmetry enables two-photon processes where an incoming pair of photons can generate an up-converted photon with the combined frequency, or a high-energy photon can be split into a correlated pair of down-converted photons. Here, we identify few-layer graphene films that offer up/down-conversion capability in the infrared spectral range. For mixed stacking tetralayers (ABCB), which are non-centrosymmetric 2D crystals, we find highly efficient nearly resonant up/down-conversion of [ω_1,ω_2] photon pairs into/from a photon with $0.7eV<Ω=ω_1+ω_2<1.1$eV. We also note that a pronounced second-order nonlinearity in the spectral range of $0.7eV<Ω<0.9$eV can be promoted in rhombohedral tri- and tetralayers by asymmetrical encapsulation. Potentially, for fibers coated with few-layer graphene, this opens the door for ``in fiber" production of photon pairs with correlated polarizations.
ER -