Bright Second Harmonic Emission from Photonic Crystal Vertical Cavity

Qu, Lun; Gu, Zhidong; Li, Chenyang; Qin, Yuan; Zhang, Yiting; Zhang, Di; Zhao, Jiaxian; Liu, Qiang; Jin, Chunyan; Wang, Lishuan; Wu, Wei; Cai, Wei; Liu, Huasong; Ren, Mengxin; Xu, Jingjun

doi:10.1002/adfm.202308484

Adv Funct Materials

2023

DOI: 10.1002/adfm.202308484

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Bright Second Harmonic Emission from Photonic Crystal Vertical Cavity

Lun Qu,

Zhidong Gu,

Chenyang Li

et al.

Abstract: This study presents photonic vertical cavities consisting of nonlinear materials embedded in photonic crystals (PhCs) for resonantly enhancing second harmonic generation (SHG). Previous attempts at SHG in such structures have been limited to efficiencies of 10−7 to 10−5, but a high SHG efficiency of 0.28% by constructing a vertical cavity with a lithium niobate membrane placed between two PhCs is demonstrated, which exhibits high‐quality resonances. The results open up new possibilities for compact laser frequ… Show more

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2024

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Cited by 8 publications

References 59 publications

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Advances in Photonic Crystal Research for Structural Color

Chen,

Wei,

Pan

et al. 2024

Adv Materials Technologies

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Structural color is a remarkable physical phenomenon that exists widely in nature. Unlike traditional color rendering methods, they are realized mainly through micro/nanostructures that interfere, diffract, scatter light, and exhibit long‐life and environmental‐friendly color effects. In nature, a few organisms use their color‐changing system to transmit information, such as courtship, warning, or disguise. Meanwhile, some natural inorganic minerals can also exhibit structural colors. Learning from nature, scientists have achieved large‐scale structural color design and manufacturing technology for artificial photonic crystals. Photonic crystals have a unique microstructure that forms a band gap under the action of the periodic potential field, consequently causing Bragg scattering due to the periodic arrangement of different refractive index media within them. Because of the apparent photonic band gap and the ability to form local photons at crystal defects, photonic crystals have been extensively studied in recent years and have broad application prospects in photonic fibers, optical computers, chips, and other fields. In this review, the research, properties, and applications of photonic crystals in recent years are presented, as well as insight into the future developments of photonic crystals.

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Advances in Photonic Crystal Research for Structural Color

Chen,

Wei,

Pan

et al. 2024

Adv Materials Technologies

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Tailoring Second Harmonic Generation via Strong Coupling in a One‐Dimensional Photonic Crystal Heterostructure

Zhu,

Ma,

Dong

et al. 2024

Advanced Photonics Research

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Controlling harmonic generation is crucial for nonlinear optics and nanophotonic devices. Herein, a 1D photonic crystal heterostructure is theoretically proposed comprising a metal film, a lithium niobate layer, and a distributed Bragg reflector with a defect layer. The Tamm state and the defect state for dual‐band second‐harmonic generation (SHG) enhancement simultaneously are numerically investigated. Finite‐element method simulations indicate that SHG efficiencies based on Tamm plasmons and the defect state are 6.85 × 10−6 and 3.28 × 10−4, respectively. Intriguingly, the strong coupling between the defect state and Tamm plasmons enables spatial energy exchange, leading to the SHG switching between them. In the strong coupling region with Rabi splitting energy up to 5.5 meV, the SHG conversion efficiency reaching 5 × 10−5 is observed for both two new hybridized states. During the entire anticrossing Rabi splitting process, the SHG efficiency difference between two resonances can be modulated by up to two orders of magnitude. The coupling strength between two resonances is adjusted by varying the position of the defect layer. Simulation results are consistent with the coupled oscillator model. This work not only offers a platform for studying nonlinear frequency conversion but also establishes a new method of using strong coupling to tailor SHG.

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Tunable Intracavity Coherent Up‐Conversion with Giant Nonlinearity in a Polar Fluidic Medium

Okada,

Nishikawa,

Araoka

2024

Advanced Science

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The study has demonstrated a novel microcavity‐based flexible photon up‐conversion system using second harmonic generation (SHG) from a polar nematic fluidic medium doped with a laser dye. The idea is based on coherent light generation via stimulated emission (lasing) and simultaneous frequency doubling inside a microcavity. The polar nematic fluid equips very high even‐order optical nonlinearity due to its polar symmetry and large dipole moment along the molecular long axis. At the same time, its inherent fluidic nature allows to easily functionalize the media just by doping, in the present case, with an emissive laser dye. The demonstrated system exhibits a giant nonlinear optical response to input light, while enabling spectral narrowing and multiple‐signal output of up‐converted light, which is not attainable through the simple SH‐conversion of input light. Furthermore, the susceptibility of the liquid crystal offers dynamic modulation capabilities by an external stimulus, such as signal switching by the application of electric field or wavelength tuning through temperature variation. Such a brand‐new type of simple coherent flexible up‐conversion system must be promising as a new principle for easily accessible and down‐scalable wavelength conversion devices.

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Bright Second Harmonic Emission from Photonic Crystal Vertical Cavity

Cited by 8 publications

References 59 publications

Advances in Photonic Crystal Research for Structural Color

Advances in Photonic Crystal Research for Structural Color

Tailoring Second Harmonic Generation via Strong Coupling in a One‐Dimensional Photonic Crystal Heterostructure

Tunable Intracavity Coherent Up‐Conversion with Giant Nonlinearity in a Polar Fluidic Medium

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