Plasmonic Coupling in Three-Dimensional Au Nanoparticle Assemblies Fabricated by Anodic Aluminum Oxide Templates

We investigated optical properties of three-dimensional (3D) assemblies of Au nanoparticles (NPs), which were fabricated by dewetting of thin Au layers on anodic aluminum oxides (AAO). The NP assembly had hexagonal array of repeated multiparticle structures, which consisted of six trimers on the AAO surface and one large NP in the AAO pore (pore-NP). We performed finite-difference time-domain simulation to explain the optical response of the NP assemblies and compared the calculation results with experimental data. Such complementary studies clearly revealed how the plasmonic coupling between the constituent NPs influenced the spectral response of our NP assemblies. In particular, comparison of the assemblies with and without pore-NPs suggested that strong plasmonic coupling between trimers and pore-NP significantly affected the spectra and the field distribution of the NP assemblies. Plasmonic multi-NP assemblies could provide us new platforms to realize novel optoelectronic devices.

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Three-dimensional nanomasks using block copolymers confined in the nanopores of anodic aluminum oxide templates

Materials Today Communications ◽

10.1016/j.mtcomm.2015.04.002 ◽

2015 ◽

Vol 3 ◽

pp. 52-56 ◽

Cited By ~ 4

Author(s):

Chiang-Jui Chu ◽

Chia-Hua Lin ◽

Pei-Yun Chung ◽

Ming-Hsiang Cheng ◽

Kai-Sheng Jeng ◽

...

Keyword(s):

Block Copolymers ◽

Aluminum Oxide ◽

Anodic Aluminum Oxide ◽

Three Dimensional ◽

Anodic Aluminum ◽

Anodic Aluminum Oxide Templates

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Investigation on Light Extraction Behavior of Surface Plasmon-Coupled Deep-Ultraviolet LED in Different Emission Directions

Crystals ◽

10.3390/cryst12010082 ◽

2022 ◽

Vol 12 (1) ◽

pp. 82

Author(s):

Mei Ge ◽

Yi Li ◽

Youhua Zhu ◽

Meiyu Wang

Keyword(s):

Surface Plasmon ◽

Three Dimensional ◽

Strong Absorption ◽

Light Extraction ◽

Light Extraction Efficiency ◽

Time Domain Simulation ◽

Al Nanoparticles ◽

Extraction Behavior ◽

Deep Ultraviolet ◽

Difference Time

The light extraction behavior of an AlGaN-based deep-ultraviolet LED covered with Al nanoparticles (NPs) is investigated by three-dimensional finite-difference time-domain simulation. For the transmission spectra of s- and p-polarizations in different emission directions, the position of maximum transmittance can be changed from (θ = 0°, λ = 273 nm) to (θ = 0°, λ = 286 nm) by increasing the diameter of Al NPs from 40 nm to 80 nm. In the direction that is greater than the critical angle, the transmittance of s-polarization is very small due to the strong absorption of Al NPs, while the transmittance spectrum of p-polarization can be observed obviously for the 80 nm Al NPs structure. For a ~284 nm AlGaN-based LED with surface plasmon (SP) coupling, although the luminous efficiency is significantly improved due to the improvement of the radiation recombination rate as compared with the conventional LED, the light extraction efficiency (LEE) is lower than 2.61% of the conventional LED without considering the lateral surface extraction and bottom reflection. The LEE is not greater than ~0.98% (~2.12%) for an SP coupling LED with 40 nm (80 nm) Al NPs. The lower LEE can be attributed to the strong absorption of Al NPs.

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