Wavelength-selective second-harmonic splitting and focusing in engineered χ ⁽²⁾ photonic crystals
- 1Australian National University
Abstract
We demonstrate a multifunctional engineered χ ⁽²⁾ photonic crystal that integrates second-harmonic generation, wavelength selectivity, beam splitting, and focusing within a single χ ⁽²⁾ -modulated ferroelectric photonic structure. Rather than encoding a single nonlinear wavefront, the engineered spatial χ ⁽²⁾ modulation multiplexes wavelength-dependent phase-mismatch compensation and wavefront-encoding conditions, allowing different pump wavelengths to access distinct second-harmonic focusing responses. As a proof of concept, a 1050 nm pump is converted to 525 nm second-harmonic light and focused into two spatially separated spots, whereas a 1100 nm pump is converted to 550 nm second-harmonic light and focused into three spots. The measured multi-spot patterns and deflection angles agree well with the numerical design, while wavelength-resolved measurements confirm selective excitation of the encoded double-focus and triple-focus channels. These results establish a compact strategy for multiplexing independently prescribed nonlinear output functions within a single engineered χ ⁽²⁾ structure.
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BibTeX
@article{cui2026wavelengthselective,
title = {{Wavelength-selective second-harmonic splitting and focusing in engineered χ ⁽²⁾ photonic crystals}},
author = {Zongheng Cui and Tianxiang Xu and Shan Liu and Ruwei Zhao and Yan Sheng},
journal = {Optics Express},
year = {2026},
month = oct,
doi = {10.1364/oe.612943},
url = {https://opg.optica.org/abstract.cfm?URI=oe-34-21-39108},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Wavelength-selective second-harmonic splitting and focusing in engineered χ ⁽²⁾ photonic crystals
AU - Zongheng Cui
AU - Tianxiang Xu
AU - Shan Liu
AU - Ruwei Zhao
AU - Yan Sheng
PY - 2026
DA - 2026/10/07
JO - Optics Express
DO - 10.1364/oe.612943
UR - https://opg.optica.org/abstract.cfm?URI=oe-34-21-39108
AB - We demonstrate a multifunctional engineered χ ⁽²⁾ photonic crystal that integrates second-harmonic generation, wavelength selectivity, beam splitting, and focusing within a single χ ⁽²⁾ -modulated ferroelectric photonic structure. Rather than encoding a single nonlinear wavefront, the engineered spatial χ ⁽²⁾ modulation multiplexes wavelength-dependent phase-mismatch compensation and wavefront-encoding conditions, allowing different pump wavelengths to access distinct second-harmonic focusing responses. As a proof of concept, a 1050 nm pump is converted to 525 nm second-harmonic light and focused into two spatially separated spots, whereas a 1100 nm pump is converted to 550 nm second-harmonic light and focused into three spots. The measured multi-spot patterns and deflection angles agree well with the numerical design, while wavelength-resolved measurements confirm selective excitation of the encoded double-focus and triple-focus channels. These results establish a compact strategy for multiplexing independently prescribed nonlinear output functions within a single engineered χ ⁽²⁾ structure.
SN - 1094-4087
ER -