Multilevel Spherical Photonic Crystals with Controllable Structures and Structure‐Enhanced Functionalities,Advanced Optical Materials

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Multilevel Spherical Photonic Crystals with Controllable Structures and Structure‐Enhanced Functionalities
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-03-17 , DOI: 10.1002/adom.201902164
Juan Wang _{1,

2} , Hai Le‐The _{2,

3} , Lingling Shui _{1,

4} , Johan G. Bomer ₂ , Mingliang Jin _{1,

4} , Guofu Zhou _{1,

4} , Paul Mulvaney _{4,

5} , Pepijn W. H. Pinkse ₆ , Albert Berg ₂ , Loes I. Segerink ₂ , Jan C. T. Eijkel ₂

Affiliation

Spherical photonic crystals (SPCs) with tailorable multiscale structure, versatile surface morphology, and controllable optical properties of both photonic stop band (PSB) and surface plasmon resonance (SPR), have been fabricated using a robust and facile method. The fabricated SPCs consist of well‐spaced gold nanocrystals (AuNCs) (3rd‐tier) anchored on silica nanopatterns (2nd‐tier) confined in microspherical templates (1st‐tier). Droplet microfluidics is used to produce microdroplets containing silica nanoparticles (SiO₂NPs) which assemble to form two‐tier SPCs. Subsequently, three‐tier SPCs are obtained by thermal dewetting and evaporation of metal films deposited on the two‐tier SPCs, with the 3rd‐tier morphology being controlled by the deposited film morphology and programmed thermal annealing. Optical PSB and SPR properties of the prepared SPCs can be on‐demand tailored by the 2nd and 3rd‐tier morphology and their corresponding constituent materials. It is found that the scattering from AuNC arrays on the SPCs can be amplified by tailoring the PSB properties. The hierarchical SPCs manufactured by this method take advantages of low‐cost, high controllability, and further processability. The manufacturing of flexible film encapsulated well‐assembled SPCs as anticounterfeiting stamps, which are easy to be identified using the mobile phone with a flash, is demonstrated.

中文翻译：

具有可控结构和增强功能的多层球形光子晶体

球形光子晶体（SPC）具有可定制的多尺度结构，通用的表面形态以及可控的光子阻带（PSB）和表面等离振子共振（SPR）的光学特性，已使用一种健壮且简便的方法制造。制成的SPC由间距固定的金纳米晶体（AuNCs）（第三层）固定在微球模板（第一层）内的二氧化硅纳米图案（第二层）上。液滴微流体用于生产包含二氧化硅纳米颗粒（SiO ₂NP）组装成两层SPC。随后，通过对两层SPC上沉积的金属膜进行热脱湿和蒸发，获得三层SPC，其中第三层的形貌由沉积的膜形貌和编程的热退火控制。制备的SPC的光学PSB和SPR特性可以根据第二层和第三层形态及其相应的构成材料进行定制。发现可以通过调整PSB特性来放大SPC上AuNC阵列的散射。通过这种方法制造的分层SPC具有低成本，高可控制性和进一步可加工性的优点。柔性膜封装的，组装良好的SPC作为防伪邮票，使用带闪光灯的手机很容易识别，

更新日期：2020-03-17

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