TY - JOUR
T1 - Efficient Second-Harmonic Generation from Silicon Slotted Nanocubes with Bound States in the Continuum
AU - Fang, Cizhe
AU - Yang, Qiyu
AU - Yuan, Qingchen
AU - Gu, Linpeng
AU - Gan, Xuetao
AU - Shao, Yao
AU - Liu, Yan
AU - Han, Genquan
AU - Hao, Yue
N1 - Publisher Copyright:
© 2022 Wiley-VCH GmbH.
PY - 2022/5
Y1 - 2022/5
N2 - Optical materials with centrosymmetry, such as silicon and germanium, are unfortunately absent of second-order nonlinear optical responses, hindering their developments in efficient nonlinear optical devices. Here, a design with an array of slotted nanocubes is proposed to realize remarkable second harmonic generation (SHG) from the centrosymmetric silicon, which takes advantage of enlarged surface second-order nonlinearity, strengthened electric field over the surface of the air-slot, as well as the resonance enhancement by the bound states in the continuum. Compared with that from the array of silicon nanocubes without air-slots, SHG from the slotted nanocube array is improved by more than two orders of magnitude. The experimentally measured SHG efficiency of the silicon slotted nanocube array is high as 1.8 × 10−4 W−1, which is expected to be further engineered by modifying the air-slot geometries. The result can provide a new strategy to expand nonlinear optical effects and devices of centrosymmetric materials.
AB - Optical materials with centrosymmetry, such as silicon and germanium, are unfortunately absent of second-order nonlinear optical responses, hindering their developments in efficient nonlinear optical devices. Here, a design with an array of slotted nanocubes is proposed to realize remarkable second harmonic generation (SHG) from the centrosymmetric silicon, which takes advantage of enlarged surface second-order nonlinearity, strengthened electric field over the surface of the air-slot, as well as the resonance enhancement by the bound states in the continuum. Compared with that from the array of silicon nanocubes without air-slots, SHG from the slotted nanocube array is improved by more than two orders of magnitude. The experimentally measured SHG efficiency of the silicon slotted nanocube array is high as 1.8 × 10−4 W−1, which is expected to be further engineered by modifying the air-slot geometries. The result can provide a new strategy to expand nonlinear optical effects and devices of centrosymmetric materials.
KW - bound states in the continuum
KW - dielectric nanostructures
KW - second-harmonic generation
KW - silicon
UR - http://www.scopus.com/inward/record.url?scp=85124557286&partnerID=8YFLogxK
U2 - 10.1002/lpor.202100498
DO - 10.1002/lpor.202100498
M3 - 文章
AN - SCOPUS:85124557286
SN - 1863-8880
VL - 16
JO - Laser and Photonics Reviews
JF - Laser and Photonics Reviews
IS - 5
M1 - 2100498
ER -