Great chiral fluorescence from the optical duality of silver nanostructures enabled by 3D laser printing

Wen, Hongjing; Song, Shigeng; Xie, Fei; Wang, Bin; Xu, Jian; Feng, Ziwei; Wu, Shiyu; Han, Jing; Guan, Bai‐Ou; Xu, Xiaoxuan; Li, Xiangping

doi:10.1039/d0mh01207f

Cited by 13 publications

(8 citation statements)

References 45 publications

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“…Pre-doped with diamine silver complex, the hydrogel matrix was used as a dynamic platform. Upon irradiation of femtosecond laser beam, [Ag(NH3) 2 ] + complex ions near the tight focus can gain energy through two-photon absorption (TPA) process and dissociate to form neutral Ag nanodots attached to the gel network 29 . Remarkably, compared to the photoluminescent dyes employed in common strategies, Ag nanodots are free of the adverse photobleaching effect and exhibit intense scattering from their surface plasmon effect that like other noble metals 30 , making them compelling candidate for optical data storage and reversible data encryption.…”

Section: Introductionmentioning

confidence: 99%

Reversible data encryption–decryption using a pH stimuli-responsive hydrogel

Wen

Zeng

et al. 2021

J. Mater. Chem. C

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Section: Introductionmentioning

confidence: 99%

Reversible data encryption–decryption using a pH stimuli-responsive hydrogel

Wen

Zeng

et al. 2021

J. Mater. Chem. C

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“…It is well known that the focal depth of an imaging system is given by the formula

[ 35 ] (where n is the refractive index of the object area, λ is the wavelength of incident light, NA is the numerical aperture of the microscope objective, e represents the minimum distance that the human eye can distinguish, and M is the magnification of the viewing angle). Due to the diffraction of light, two objects spaced less than the D.O.F.…”

Section: Resultsmentioning

confidence: 99%

“…For data recording and reading, the hydrogel was pre-doped with a diamine silver complex ([Ag(NH 3 ) 2 ] + ). Under the irradiation of femtosecond laser beam, the [Ag(NH 3 ) 2 ] + complex ions in the vicinity of the tight focus obtained enough energy through a two-photon absorption process and reacted to form Ag nanopatterns attached to the gel network [ 35 ]. Notably, silver nanopatterns reveal strong surface plasmon-scattering effects similarly to noble nanometals [ 36 ], making them a gratifying candidate for optical data storage and data encryption.…”

Section: Introductionmentioning

confidence: 99%

Security-Enhanced 3D Data Encryption Using a Degradable pH-Responsive Hydrogel

et al. 2021

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Based on degradable pH-responsive hydrogel, we report on an enhanced three-dimensional data encryption security technique in which a pH value is used for information manipulation. Featuring three types of states upon the pH value variation, namely, shrinkage, expansion and degradation, the hydrogel renders a limited pH value window as the “key” for information decryption. The pH-dependent shrinkage-to-expansion conversion of the hydrogel leads to a threshold pH value for retrieving the recorded data, whilst the degradability of the hydrogel, which can be tuned by adjusting the composition ratio of PEGDA/AAc, gives rise to a second threshold pH value for irreversibly sabotaging the retrieved data. Pre-doping silver ions in the hydrogel facilitates explicit recording and reading of binary data in forms of three-dimensional silver patterns through photoreduction and scattering, respectively, with a femtosecond laser. By accurately matching the vertical spacing of the encoded silver nanopatterns with the diffraction-limited focal depth of the decryption microscope, we can tune the pH value to encrypt and retrieve information recorded in layers and set a critical pH value to smash encoded information, which proves a highly secured 3D data encoding protocol. This strategy can effectively enrich data encryption techniques, vastly enhancing data security within unattained chemical dimensions.

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“…Laser direct writing, unlike E-beam lithography, is more facile and efficient as it is capable of generating arbitrary patterns of 2D and 3D chiral nanostructures at ambient condition. [23][24][25][26] However, as these chiral structures are normally formed based on two-photon polymerization, metal doping or electroplating has to be employed, which raises the complexity of the fabrication. Moreover, insufficient loading of metals in the chiral nanostructures may also lower their chiroptic performances.…”

Section: Introductionmentioning

confidence: 99%

Laser‐Directed Asymmetric Growth of Plasmonic Chiral Ensembles

Wang

Ding

2022

Laser & Photonics Reviews

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Chiral plasmonic system due to its enhanced chiroptic activity in the visible region has attracted numerous interests in the last decade. Although various strategies have been developed for the fabrication of chiral plasmonic nanostructures, the limitations of cost-effectiveness and controllability have been the main obstacle for their practical applications. Here, continuous wave laser is used to direct the growth of chiral ensembles of gold nanoparticles (AuNPs). These AuNPs are grown from the Au-doped titanium dioxide (TiO 2 ) films in a ring-shaped arrangement under photoreduction, which can then evolve into nanotetramers, nanotrimers, and nanodimers at different irradiation time, showing good controllability and reproducibility. Especially, the nanodimers and nanotrimers show circular differential scattering (CDS) over 20%. The optical chirality of the nanotrimers presents a prominent superchiral field, which is demonstrated for the optical sensing of chiral molecules (approximately × 10 −3 m) with large spectral dissymmetric factors. Such an unprecedented growth strategy via laser direct writing is facile, tailorable, location-selective, and ligand-free, which presents significant implications for on-chip integration of chiral nano-optic devices and surface-enhanced Raman optical activity (SEROA).

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Great chiral fluorescence from the optical duality of silver nanostructures enabled by 3D laser printing

Abstract: A 3D laser printing technique for realizing unprecedented stereo-chiral-luminescent silver nanostructures was developed to achieve a record-high fluorescent anisotropic factor.

Cited by 13 publications

References 45 publications

Reversible data encryption–decryption using a pH stimuli-responsive hydrogel

Reversible data encryption–decryption using a pH stimuli-responsive hydrogel

Security-Enhanced 3D Data Encryption Using a Degradable pH-Responsive Hydrogel

Laser‐Directed Asymmetric Growth of Plasmonic Chiral Ensembles

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