Laser-Induced Patterned Photonic Crystal Heterostructure for Multimetal Ion Recognition

Abstract

In this work, a new method of direct laser writing patterned photonic crystal heterostructure on a glass surface is proposed. A multi-heterostructure photonic crystal (MHPC) is predeposited on the glass surface and then the laser spot is focused on it and moves according to the set program, leading to the formation of patterned MHPC. Scanning electron microscopy (SEM) and finite element simulation show that the patterning is caused by the local thermal annealing of the polymer colloidal spheres through the thermal conduction effect of the substrate on the laser energy. The patterned area presents a function of the water confinement effect and can be used as a highperformance droplet analysis chip. By integrating the patterned MHPC array and seven fluorescent dyes, nine metal ions can be successfully recognized and discriminated. This approach is quite facile and fast for designing colloidal photonic crystals with controllable patterns. Moreover, it is of considerable significance for the practical application of photonic crystal heterostructure in the detection, sensing, anti-counterfeiting, and display fields.

A fluorescence-enhanced inverse opal sensing film for multi-sources detection of formaldehyde

“…The photonic stopband character renders PC to be used in various fields, such as catalyst [3,4], solar cells [5,6], anti-counterfeiting [7,8] and sensing [9][10][11][12][13]. Among these applications, the PC-based sensing for external stimuli such as temperature [14,15], humidity [16], strain [17], and chemical [18][19][20][21][22][23] and biological [10,13,[24][25][26][27] molecules have been paid more attention due to their regulable optical performance, for example using fluorescence enhancement effect [20,21], changeable photonic stopband position [22,23] or Debye diffraction effect [26,27]. Presently, a variety of PC-based sensors have been developed extensively from one-dimensional PC (1DPC) [18,19], two-dimensional PC (2DPC) [26,27] to three-dimensional PC (3DPC) [20][21][22][23].…”

Reversible Photochromic Photonic Crystal Device with Dual Structural Colors

“…A photonic crystal (PhC) provides unique optical properties for thorough control and manipulation of photons within a specific wavelength range not possible otherwise. , Three-dimensional (3D) PhCs with 3D photonic band gap (PBG) have attracted increasing interest in sensors, , lasers, , displays, , anticounterfeiting, , broadband reflectors, , light emitters, and so forth, for their abilities to reflect light and manipulate light emission in all the three dimensions. Nowadays, various two-dimensional assembly methods focusing on core–shell and multicomponent hybrid colloidal nanospheres, , such as self-assembly, , spin coating, , photolithography, deposition, , and viscoelastic shear processing, , have been used to enhance the optical properties of two-dimensional PhC films. However, the 3D assembly fabrication methods for 3D PhC devices based on nanospheres are missing research, limited by intrinsic drawbacks of poor mechanical behavior and microstructural defects (dislocation, point/line defects, and crack).…”

Solvent-Responsive Invisible Photonic Patterns with High Contrast for Fluorescence Emission Regulation and Anti-Counterfeiting

“…At present, a variety of strategies have been developed to construct IPPs by selectively modifying or manufacturing areas on photonic materials and reproducing the patterns through humidity change, mechanical force, magnetic fields, ions, or solvents. − Chen et al prepared IPPs with varying wettabilities in different regions of a hollow silica array by modifying hydrophilic cysteamine hydrochloride and hydrophobic 1H,1H,2H,2H-perfluorodecanethiol through a photoinduced Michael addition reaction. The patterned hollow silica arrays showed identical purple color and they can display hidden images in response to water vapor and ethanol/aqueous solution due to different refractive indices caused by the wetting of water in the hydrophilic region .…”