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Yikuan
Wang
College
of Physics and Electrical Engineering, Yancheng Teachers University, Jiangsu
Province, 224007 Peoples Republic of China
*Corresponding
author:
College of Physics and Electrical Engineering, Yancheng Teachers University,
Jiangsu Province, 224007 People’s Republic of China, Email: yikuanw@gmail.com
Citation: Yikuan Wang (2020)
Nano-sized Laser Beams without Diffraction Spreading. J Adv Mater Sci Innov,
1(1), 1-4.
Copyright: © 2020, Yikuan Wang, This
is an open-access article distributed under the terms of the Creative Commons
Attribution 4.0 International License, which permits unrestricted use,
distribution and reproduction in any medium, provided the original author and
source are credited.
ABSTRACT
Whereas
exciting progress has been made to beat diffraction in optical spectroscopy
[1-8], making a nano-sized laser beam remains challenging due to diffraction
spread [9,10]. Using Betheâs expression for the optical transmission
coefficient of a circular hole in a perfect conductor screen of zero thickness
[9,11]. T=1024p3a6/27l4, we found that the transmission of light with a
wavelength l=800nm through such a circular hole of a radius of 1 nm is about
~2.3 — 10-6. So a decent nano-sized laser beam for miniaturization of optical
elements is not available. Here we show that coupling Surface
Plasmon-Polaritons (SPPs) to appropriate dielectric material can result in
fundamentally diffraction-free down-sized, especially nano-sized laser beams.
For example, the composite structure Si3N4/Au (44.5nm)/SiO2(456nm)/ (SiO2,
Si3N4, SiO2) can achieve a nano-sized laser
beam of about half the incoming light intensity. This approach, by transforming
the macroscopic laser beams into multiple nano-sized laser beams, holds promise
for ultra fast laser imprinting of nano-pores for DNA sequencing and other
miniature photonic devices in optical signal processing industries.
KEYWORDS: Optical spectroscopy,
Nano-sized Laser Beams, DNA sequencing
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