Tunable plasmonic bound states in the continuum in the visible range

Sun, Shuoyan; Ding, Yu; Li, Haozhi; Hu, Peng; Cheng, Chang‐Wei; Sang, Yungang; Cao, Fengzhao; Hu, Yi; Alù, Andrea; Liu, Dahe; Wang, Zhaona; Gwo, Shangjr; Han, Dezhuan; Shi, Jianzhong

doi:10.1103/physrevb.103.045416

Cited by 56 publications

(29 citation statements)

References 46 publications

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“…Quasi-BICs have enabled various fascinating phenomena, such as biosensing, lasing, topological optics, , enhanced nonlinear effects, − and image processing . Sharp resonances in plasmonic systems driven by quasi-BICs are of particular interest due to their ultrastrong field enhancement effects. , However, the plasmonic quasi-BICs are very sensitive to the wave vector of the incident light, so that a small variation in the incident angle significantly reduces the Q factor of resonances. − In addition, the quasi-BICs are often highly angular dispersive. These two drawbacks create a real challenge for the experimental observation of high- Q quasi-BICs by using high-NA objectives collecting light over a wide range of angles.…”

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confidence: 99%

Hybrid anisotropic plasmonic metasurfaces with multiple resonances of focused light beams

Liang

Lin

et al. 2021

Nano Lett.

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Plasmonic metasurfaces supporting collective lattice resonances have attracted increasing interest due to their exciting properties of strong spatial coherence and enhanced light−matter interaction. Although the focusing of light by high-numerical-aperture (NA) objectives provides an essential way to boost the field intensities, it remains challenging to excite high-quality resonances by using high-NA objectives due to strong angular dispersion. Here, we address this challenge by employing the physics of bound states in the continuum (BICs). We design a novel anisotropic plasmonic metasurface combining a two-dimensional lattice of high-aspect-ratio pillars with a one-dimensional plasmonic grating, fabricated by a two-photon polymerization technique and gold sputtering. We demonstrate experimentally multiple resonances with absorption amplitudes exceeding 80% at mid-IR using an NA = 0.4 reflective objective. This is enabled by the weak angular dispersion of quasi-BIC resonances in such hybrid plasmonic metasurfaces. Our results suggest novel strategies for designing photonic devices that manipulate focused light with a strong field concentration.

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confidence: 99%

Hybrid anisotropic plasmonic metasurfaces with multiple resonances of focused light beams

Liang

Lin

et al. 2021

Nano Lett.

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“…In this work, we chose 630 nm as an average value for broadband enhancement. However, the strong coupling between LSPR at 630 nm and SPP can greatly modify the resonance peak and weaken the enhancement, [ 48,49 ] see Figure S2b‐d in the Supporting Information. In the future, to eliminate this effect, the pitch and groove depth should change simultaneously (doubly chirped).…”

Section: Resultsmentioning

confidence: 99%

Second Harmonic Generation Covering the Entire Visible Range from a 2D Material–Plasmon Hybrid Metasurface

Ding

Wei

et al. 2021

Advanced Optical Materials

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On‐chip coherent light source has always been fascinating and intriguing due to its various potential applications. In the past decades, there has been some progress in the development of chip coherent light (e.g., nanolaser, Bose‐Einstein condensation and nonlinear optical effects). However, these methods strictly depend on materials and extreme experimental conditions, and are usually not tunable. Here, a hybrid structure is designed which combines a chirped surface plasmon metasurface with a monolayer transition metal dichalcogenide (TMDC) to achieve a coherent second harmonic generation (SHG) covering the entire visible light spectrum. Using only finite number of metallic grooves, a continuous resonance tuning is obtained. By translating the metasurface in space, a space‐frequency locking SHG is demonstrated. Although the Q factor of the surface plasmon cavity is low, its near‐field enhancements of both fundamental and SH waves are still obvious. Significantly, the broad linewidth of plasmonic cavity leads to a large degree of overlap between adjacent localized modes, that enables the tuning of the output wavelength continuously at room temperature. Meanwhile, the exciton resonance also plays an important role. This monolithic tunable device demonstrates the potentials of 2D material‐plasmon hybrid metasurface and to construct an efficient broadband tunable on‐chip coherent light source.

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“…In Figure 15, sketches of several types of recently proposed Q-BIC metamaterials and resonators are demonstrated. [424][425][426][427][428][429][430][431][432][433] In the span of a few years, the sharpness of the optically driven resonant states in Q-BIC metamaterials has stimulated researchers to create ultraprecise plasmonic and photonic metasensors based on this technology. [434] In a leading study, [422] Mocella's team explored a novel sensing mechanism by structuring an all-dielectric photonic crystal metasurface (PhCM) to sustain plasmon-like surface waves across the NIR spectrum.…”

Section: Quasi-bound States In the Continuum (Q-bic) Metasensorsmentioning

confidence: 99%

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Photonic and Plasmonic Metasensors

Ahmadivand

Gerislioglu

2021

Laser & Photonics Reviews

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Biosensors have been designed and developed for detecting biomarkers, biomolecules, proteins, enzymes, organisms, and various types of bacterial and viral diseases since the turn of the century. Initially marred by poor sensitivity, specificity, and selectivity, the advent of the notion of photonic biosensors has successfully addressed such drawbacks. One of the hallmarks of modern pharmaceutical industries is the miniaturization of photonic platforms via continuous scaling down of their sizes, which was accomplished by leveraging the concept of artificial media. Numerous forms of photonic and plasmonic devices have been configured for next-generation technologies since the emergence of metamaterials. Among diverse applications, the development of cost-effective, label-free, selective, precise, and on-chip immunobiosensors with rapid sample-to-result feature has received copious interest, recently. This focused Review brings clarity to the rapidly growing body of available and in-development metamaterials-enabled diagnostic instruments based on inventive and promising approaches. Through centering on the operating principles of plasmonic, photonic, and hybrid metasensors, we mechanistically characterize and describe the properties of such tools and summarize the most recent achievements in devising metasensors and bioimaging tools with high precision. This insightful understanding serves as a comprehensive source for scientists, physicians, and students to construct ultradense and high-throughput clinical screening metadevices.

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Tunable plasmonic bound states in the continuum in the visible range

Cited by 56 publications

References 46 publications

Hybrid anisotropic plasmonic metasurfaces with multiple resonances of focused light beams

Hybrid anisotropic plasmonic metasurfaces with multiple resonances of focused light beams

Second Harmonic Generation Covering the Entire Visible Range from a 2D Material–Plasmon Hybrid Metasurface

Photonic and Plasmonic Metasensors

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