Giant Nonlinear Circular Dichroism from High <i>Q</i>‐Factor Asymmetric Lithium Niobate Metasurfaces

Liu, Qingsong; Cheng, Bingying; Chao, Minghao; Zhang, Wenjing; Xu, Yun; Song, Guofeng

doi:10.1002/andp.202100255

Cited by 11 publications

(2 citation statements)

References 46 publications

(51 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To further enhance the SHG conversion efficiency, it is possible to utilize high Q -factor modes based on the concept of bound state in the continuum (BIC). , This possibility has been theoretically explored, suggesting that a strong SHG enhancement can be achieved by controlling the coupling to free-space radiation through symmetry breaking and excitation of quasi-BIC modes ,, (see rows 6–8 in Table ). In particular, the concept of etchless LiNbO 3 metasurfaces, namely, periodic structures realized onto otherwise unstructured films of LiNbO 3 , has been introduced ,, to avoid the complex etching process of LiNbO 3 , while granting access to highly delocalized resonances with high Q -factors.…”

Section: Linbo3 Metasurfaces For Nonlinear Quantum and Electro-opticsmentioning

confidence: 99%

Lithium Niobate Meta-Optics

et al. 2022

View full text Add to dashboard Cite

The rapid development of optical metasurfaces, 2D ensembles of engineered nanostructures, is presently underpinning a steady drive toward the miniaturization of many optical functionalities and devices. The list of material platforms for optical metasurfaces is rapidly expanding as, over the past few years, we have witnessed a surge in establishing meta-optical elements from high-index, highly transparent materials with strong nonlinear and electro-optic properties. In particular, crystalline lithium niobate (LiNbO 3 ), already a prime material for integrated photonics, has shown great promise for novel meta-optical components, thanks to its large electro-optical coefficient and secondorder nonlinear response and its broad transparency window ranging from the visible to the mid-infrared. Recent advances in nanofabrication technology have indeed marked a new milestone in the miniaturization of LiNbO 3 platforms, hence enabling the first demonstrations of LiNbO 3 -based metasurfaces. These seminal works set a steppingstone toward the realization of ultrathin monolithic nonlinear light sources, efficient quantum sources of correlated photon pairs, as well as electro-optical modulators. Here, we review these recent advances by providing a perspective on their potential applications and examining the possible setbacks and limitations of these emerging technologies.

show abstract

Section: Linbo3 Metasurfaces For Nonlinear Quantum and Electro-opticsmentioning

confidence: 99%

Lithium Niobate Meta-Optics

et al. 2022

View full text Add to dashboard Cite

show abstract

“…These include pairs of ellipse dimers with a small outof-plane distance, [33] tilted etch twisted dimers, [34] asymmetric high aspect ratio silicon disk arrays, [35] and bilayer twisted dimers metasurfaces. [36,37] Similar mechanisms were employed to create chiral BICs in plasmonic platforms supporting surface lattice [33][34][35][36]38] The inserted images show the corresponding metasurface configurations. b) The counterparts in this work.…”

Section: Introductionmentioning

confidence: 99%

Chiral Bound States in the Continuum in Plasmonic Metasurfaces

Tang

Liang

Yao

et al. 2023

Laser & Photonics Reviews

View full text Add to dashboard Cite

Bound states in the continuum (BICs) offer novel mechanisms to boost the quality factor (Q‐factor) of resonances. Unfortunately, current studies on chiral BICs metasurfaces suffer from a fundamental trade‐off between Q‐factor and circular dichroism (CD), presenting a significant hurdle that severely limits the independent control between CD and Q‐factors. Here, 3D plasmonic metasurfaces are numerically demonstrated that overcome the trade‐off and offer high‐Q quasi‐BIC resonances (Q ≈ 938) with strong CD (≈0.67) in the mid‐infrared. These metasurfaces are made of integrated‐resonance units consisting of a twisted vertical split‐ring resonator (VSRR) and a wall. Importantly, this dissimilar dimer configuration unlocks a new degree of freedom to decouple the Q‐factor and CD, that is, the Q‐factor and CD can be relatively independently manipulated by the height of the wall and the twisted angle of the VSRR, respectively. These results provide novel paradigms to manipulate advanced chiroptical responses, with various applications that require strong CD with enhanced light–matter interaction.

show abstract

Advances in Metasurface‐Based Terahertz Sensing

Zhao,

Zhang,

Liang

2024

Advanced Physics Research

View full text Add to dashboard Cite

Terahertz (THz) technology has attracted significant attention because of its unique applications in biological/chemical sensing, medical imaging, non‐invasive detection, and high‐speed communication. Metasurfaces provide a dynamic platform for THz sensing applications, showcasing greater flexibility in design and the ability to optimize light‐matter interactions for specific target enhancements, which includes enhancing the intramolecular and intermolecular vibration modes of the target biological/chemical molecules, setting them apart from conventional approaches. This review focuses on recent THz metasurface sensing methods, including metasurfaces based on toroidal dipole and quasi‐bound states in the continuum to improve sensing sensitivity, nanomaterial‐assisted metasurfaces for specific recognition, and metasurfaces combined with microfluidic with reduce water absorption loss. Furthermore, the applications of THz metasurface sensing is reviewed, including detecting the concentration of biomolecules, cells, tissues, and microbes, THz biomolecular fingerprint absorption spectra recognition, and identifying chiral compounds using chiral and achiral metasurfaces. Finally, the prospects for the next generation of THz sensors are examined.

show abstract

Giant Nonlinear Circular Dichroism from High Q‐Factor Asymmetric Lithium Niobate Metasurfaces

Cited by 11 publications

References 46 publications

Lithium Niobate Meta-Optics

Lithium Niobate Meta-Optics

Chiral Bound States in the Continuum in Plasmonic Metasurfaces

Advances in Metasurface‐Based Terahertz Sensing

Contact Info

Product

Resources

About