Citation: Kang, S.-M. Study of
Optical Information Recording
Mechanism Based on Localized
Surface Plasmon Resonance with Au
Nanoparticles Array Deposited
Media and Ridge-Type Nanoaperture.
Nanomaterials 2022, 12, 1350. https://
doi.org/10.3390/nano12081350
Academic Editors: Ki-Hyun Kim and
Deepak Kukkar
Received: 23 March 2022
Accepted: 13 April 2022
Published: 14 April 2022
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Article
Study of Optical Information Recording Mechanism Based on
Localized Surface Plasmon Resonance with Au Nanoparticles
Array Deposited Media and Ridge-Type Nanoaperture
Sung-Mook Kang
School of Electronic and Electrical Engineering, Daegu Catholic University, Hayangro 13-13, Hayang-eup,
Gyeongsan-si 38430, Gyeongbuk, Korea; kangsm@cu.ac.kr
Abstract:
To verify the possibility of multiple localized surface plasmon resonance based optical
recording mechanism, the present study has demonstrated that an Au nanoparticles array deposited
with media combined with a ridge-type nanoaperture can amplify the |
E
|
2
intensity of the incident
optical light transmitted into the media under specific conditions. Using a numerical Finite-Difference
Time-Domain method, we found that the optical intensity amplification first occurred in the near-
field region while penetrating the ridge-type nanoaperture, then the second optical amplification
phenomenon was induced between the metal nanoparticles, and eventually, the excitation effect was
transferred to the inside of the media. In a system consisting of a Gold (Au) NPs deposited media
and nanoaperture, various parameters to increase the |
E
|
2
intensity in the near-field region were
studied. For an Au nanoparticle size (Cube) = 5 nm
×
5 nm
×
5 nm, an inter-particle space = 10 nm,
and a gap (between nanoaperture and media) = 5 nm, the |
E
|
2
intensity of a ridge-type nanoaperture
with an Au nanoparticles array was found to be ~47% higher than the |
E
|
2
intensity of a ridge-type
nanoaperture without an Au nanoparticles array.
Keywords:
ridge-type nanoaperture; nanoparticle; localized surface plasmon resonance; optical
recording; Finite-Difference Time-Domain
1. Introduction
When light passes through metal nanoparticles (NPs)/nanostructures, it causes large
enhancement of the electric field near the surface of the particles. This phenomenon is
known as localized surface plasmon resonance (LSPR) [
1
–
6
]. Several studies related to
LSPR, such as nanoscale pattering (or lithography), solar cell technology, and biotechnology,
have been reported to date and are still ongoing [
7
–
27
]. In biotechnology in particular,
the conventional fluorescence method generally requires nanoparticle (NP)-labeling to
collect bioinformation [
28
]. However, several disadvantages, such as chemical instability,
environmental quantum yield, and the high cost of detection instruments are yet to be
overcome. As an alternative to this problem, we reported a study of LSPR based on
an optical recording mechanism using a Gold (Au) NPs array deposited phase-change
recording layer [29].
In our previous study [
29
], the method proposed aimed to induce an optical amplifica-
tion effect based on the LSPR phenomenon by placing metal NPs on the upper surface of
the recording media and focusing an incident beam with an objective lens. Furthermore,
we confirmed the optical power amplification effect under specific conditions. However,
to improve the signal to noise ratio (SNR), a higher optical power needed to be focused
on the information recording layer of the media. Therefore, it was necessary to investigate
the amplification of the incident beam more strongly and obtain a small-sized optical spot.
As a solution, we reviewed a nanoscale bowtie, H- (or I-), and C-shaped aperture that
could induce high optical amplification by forming a small-sized optical spot, with size
less than a wavelength in the near-field region [
30
–
37
]. (The C-shaped aperture has been
Nanomaterials 2022, 12, 1350. https://doi.org/10.3390/nano12081350 https://www.mdpi.com/journal/nanomaterials
