Photoelastic plasmonic metasurfaces with ultra-large near infrared spectral tuning

Liu, Jianxun; Zeng, Hao; Cheng, Ming-Yuan; Wang, Zhenming; Wang, Jiawei; Cen, Mengjia; Luo, Dan; Priimägi, Arri; Liu, Yan Jun

doi:10.1039/d1mh01377g

Cited by 19 publications

(12 citation statements)

References 84 publications

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“…Flat optics and metasurfaces, as representatives of planar nanophotonics, exhibit brilliant capability of arbitrarily manipulating light field in subwavelength scale, [1][2][3][4] thus promoting various applications for structural color, [5][6][7][8] beam steering, [9][10][11][12] meta-holography, [13][14][15][16][17][18] lensing, [19][20][21] etc. To endow the post-fabrication tuning ability of the optical devices, several tunable materials such as liquid crystals, [22][23][24][25][26][27][28] phase-change materials, [29][30][31] transparent conductive materials, [32,33] elastomeric polymer, [34][35][36] doped semiconductors, [37,38] and chemically-responsive materials [39] have been employed to construct the nanodevices. Although a variety of impressive demonstrations have been achieved using those tunable materials, a critical challenge for meta-optics devices is to realize versatile, colorful displays with a practical tuning mechanism, high-speed responsivity, continuous tuning, simplified fabrication, and large-area optical modulation.…”

Section: Introductionmentioning

confidence: 99%

Direct‐Printing Hydrogel‐Based Platform for Humidity‐Driven Dynamic Full‐Color Printing and Holography

Dai

Shi

et al. 2022

Adv Funct Materials

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Hydrogel materials endow the flat optics platform with active tuning capability, owing to their remarkable humidity‐responsive swelling behavior. Despite recent advances in hydrogel‐based devices for spectral tuning, their complex patterning processing and limited functionality obstruct them from practical applications. Herein, a single‐step direct‐printing technique is originally demonstrated with an active hydrogel material platform for realizing unprecedented multi‐field full‐color display dynamics. Through exploring the dose‐induced shrinkage on polyvinyl alcohol, the stepwise hydrogel nanocavities sandwiched by ultrathin metallic films can be directly printed by grayscale e‐beam lithography. Due to the tunable structural coloration from hydrogel nanocavity scaling, multi‐functionalities are successfully created for optical concealment, dynamic coloring, and dynamic full‐color holography. By encoding the cavity‐dependent transmission phase into the direct‐printed hydrogel platform, it originally enables the projected full‐color holographic dynamics in real‐time by simply exhalation, beyond the static holographic display or monochromatic holographic switching. The proposed active displays can rapidly respond to the surrounding humidity change at a millisecond‐level (< 150 ms). Such a direct‐printing strategy for hydrogel nanocavity represents a critical advance toward the unprecedented dynamic full‐color display, and suggests promising applications in optical security, gas sensing, multispectral imaging, full‐color holography, and next‐generation display techniques.

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Section: Introductionmentioning

confidence: 99%

Direct‐Printing Hydrogel‐Based Platform for Humidity‐Driven Dynamic Full‐Color Printing and Holography

Dai

Shi

et al. 2022

Adv Funct Materials

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“…These include the application of magnetic, , electric, and optical , fields. Furthermore, a diverse range of tunable metasurfaces based on mechanical actuation, − phase-change materials, − and liquid crystals − exist, offering dynamic tuning of optical properties. For a metasurface, the collective response of subwavelength-sized resonators is primarily determined by the resonator geometry and size. , Integrating the emitter into a tunable metasurfaces would allow for active emission tuning.…”

Section: Introductionmentioning

confidence: 99%

Humidity-Controlled Tunable Emission in a Dye-Incorporated Metal–Hydrogel–Metal Cavity

et al. 2022

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Actively controllable photoluminescence is potent for a wide variety of applications from biosensing and imaging to optoelectronic components. Traditionally, methods to achieve active emission control are limited due to complex fabrication processes or irreversible tuning. Here, we demonstrate active emission tuning, achieved by changing the ambient humidity in a fluorescent dye-containing hydrogel integrated into a metal–insulator–metal (MIM) system. Altering the overlapping region of the MIM cavity resonance and the absorption and emission spectra of the dye used is the underlying principle to achieving tunability of the emission. We first verify this by passive tuning of cavity resonance and further experimentally demonstrate active tuning in both air and aqueous environments. The proposed approach is reversible, easy to integrate, and spectrally scalable, thus providing opportunities for developing tunable photonic devices.

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“…Since EBL can pattern features with nanometer resolution, it should be possible to create dynamic optical metamaterials using this technique as well, similar to what has been accomplished for elastomeric materials. [ 26 ]…”

Section: Discussionmentioning

confidence: 99%

Dynamic Optical Grating Based on a Photomechanical Molecular Crystal

Berges

Bekyarova

et al. 2023

Advanced Optical Materials

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Organic photomechanical crystals transform molecular‐scale photoisomerization events into largescale crystal shape changes. The results in this paper demonstrate that this photomechanical motion can be harnessed to reconfigure reflective elements on the crystal surface to actively control light propagation. This is accomplished by using a single organic photomechanical crystal composed of 1,2‐bis(2,4‐dimethyl‐5‐phenyl‐3‐thienyl)‐3,3,4,4,5,5‐hexafluoro‐1‐cyclopentene, which undergoes a reversible ring‐open to ring‐closed photoisomerization. Electron beam lithography patterning followed by a sublimation development step leaves periodically positioned, 120 nm deep grooves that are coated with gold metal to form a reflective grating on the crystal surface. Under UV irradiation, expansion of the bulk crystal increases the grating period by ≈5% and changes the diffraction angle of a 633 nm probe laser beam by 0.7° (first order) and 1.3° (second order). The grating period change can be reversed by visible light exposure and repeated for multiple cycles. The crystal expansion and thus the diffraction angle can also be continuously tuned by controlling the duration of light exposure. Anisotropic crystal expansion and contraction due to molecular photoisomerization enables low‐power light sources to steer light beams continuously over a range of diffraction angles.

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Photoelastic plasmonic metasurfaces with ultra-large near infrared spectral tuning

Abstract: Metasurfaces, consisting of artificially fabricated sub-wavelength meta-atoms with pre-designable electromagnetic properties, provide novel opportunities to a variety of applications such as light detectors/sensors, local field imaging and optical displays. Currently,...

Cited by 19 publications

References 84 publications

Direct‐Printing Hydrogel‐Based Platform for Humidity‐Driven Dynamic Full‐Color Printing and Holography

Direct‐Printing Hydrogel‐Based Platform for Humidity‐Driven Dynamic Full‐Color Printing and Holography

Humidity-Controlled Tunable Emission in a Dye-Incorporated Metal–Hydrogel–Metal Cavity

Dynamic Optical Grating Based on a Photomechanical Molecular Crystal

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