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Xie D.,Sichuan University | Xie D.,HIGH-TECH | Su Y.,Sichuan University | Su Y.,HIGH-TECH | And 12 more authors.
Microelectronic Engineering | Year: 2016

Chirality plays a key role in biochemical reaction and the self-assembled mechanism of life. The detection of chiral molecules is one crucial issue in biology, clinic, pharmacy and food security fields, which usually refers to the detectable chiroptical effect, i.e. circular dichroism (CD) and optical rotatory dispersion (ORD) Gansel et al. (2009), Quake and Scherer (2000), Pendry (2004), Zhang et al. (2009), Kastel et al. (2007) [1-5]. However, the chiroptical effect from chiral molecules in nature (such as proteins and DNAs) is usually very small and located in ultraviolet spectral region. This limits the detection sensitivity of chiral molecules and their ability to control electromagnetic wave. In this paper, we report a scalable fabrication of a new kind of chiral molecule@nanoparticle complex materials, which are composed of an achiral nano-cup array and a pair of chiral molecules (l-/d-cysteine). The nano-cup array with localized surface plasmonic response peak of 630 nm is obtained with the micro-sphere assembly technique, which is a kind of scalable, low-cost and material-independent fabrication method. After coating a layer of chiral molecules on the surface of the nano-cup array, a clear induced-CD peak in visible region is demonstrated from the l/d-cysteine@nano-cups complex materials, the intensity of which can be much greater than the existing results [9-16]. Full-wave electromagnetic simulation method has been performed to get insight into the mechanism of the induced chiroptical effect. The simulation results indicate that this giant induced CD signal should be attributed to the electromagnetic interaction between chiral molecules and plasmonic nanostructures, especially for the wave at the plasmonic resonance peak. These results indicate the potential application prospect of these newly-fabricated complex chiral materials. © 2016 Elsevier B.V. All rights reserved.

Huang L.,Sino British Joint Materials Research Institute | Hu D.,Sino British Joint Materials Research Institute | Zhang Z.,Sichuan University | Gao F.,Sino British Joint Materials Research Institute | Du J.,Sichuan University
Microelectronic Engineering | Year: 2014

In this paper, we proposed that local field intensity can be further enhanced by using the light beam carrying the angular momentum to excite the surface plasmon polariton (SPP). The physical process of interaction between the beam carrying the different angular momentum and metal triangles nano-ring(MTNR) and the local SPP enhancement effect are discussed in detail. When the angular momentum of light beam match well with MTNR structure, local electric field will be further enhanced, which provide an effective way to enhanced the localized surface plasmon polaritons (LSPPs).We finally fabricated the MTNR by using microspheres self-assembly and vacuum depositing method and give a proposal experiment to verify the further enhancement of LSPP based on exciting light beam carrying angular momentums. © 2014 Elsevier B.V. All rights reserved.

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