dielectric resonator nanoantenna at optical frequencies
TRANSCRIPT
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WELCOME
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DIELECTRIC RESONATOR NANOANTENNA AT OPTICAL FREQUENCIES
Guided by, presented by, MRS SABITHA SUDAKAR Yadhu Krishnan SASSISTANT PROFESSOR ECE S7 ECE, ROLL NO:34
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CONTENTS
• INTRODUCTION• NANO-ANTENNA• PROPOSED CONFIGURATION• SOFTWARE TOOL• RESULTS• ADVANTAGES• DISADVANTAGES• CONCLUSION• REFERENCE
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INTRODUCTION
• To fulfill the growing demands of high data rate communication, researches are now focusing on high frequency bands.
•Comparing to the traditional rf antennas, an equilateral triangular dielectric resonator nano-antenna has been designed and simulated at 193.5THz.
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Nano-antennas• A nanoscale antenna-like structure for sending and
transmitting electromagnetic waves.• Nanoantenna , technology being developed to convert light
into electric power.• Magnetic radiations into electric signals.
• Fig:1 shows a single and an array of nano-antenna.
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• Fig:2 structure of nano-antenna
• The proposed nano-antenna consists of ‘Ag-SiO2-Ag’ structure having a resonating ‘Si’ dielectric with an equilateral triangular shape.
• The antenna exhibitsan impedance bandwidth of 2.58 % at a center frequency of 193.5THz.
• The nano antenna achieves a directivity of 8.6 dBi with an end-fire radiation pattern.
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Proposed antenna configuration
• The proposed configuration of the ETDRNA, designed to operate at a wavelength of 1.55
• The corresponding central frequency is 193.5 THz.• The dimensions of equilateral triangular dielectric are
calculated from equation
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• Fig: Side view of ETDRNA
where ‘ =8.85x10-12[F/m], ) = 5, plasmonic frequency fp =1.41e16 rad/s, f =central frequency and collision frequency =2.98e13.
• Fig: top view
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Software tool•CST MWS 2012.
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Result• The simulated return loss (S11) and directivity of the
nanoantenna is shown in Figure.• The ETDRNAexhibits resonance frequency at 193.5 THz
(0=1.55 m) with maximum dip around −22 dB.
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Radiation pattern
Fig: 3D end-fire pattern at 193.5 THz
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Advantages• High data rate transmission.• efficiency will be greater than 85%. • can absorb any frequency of light.• Nanoantennas can provide us with a large
energy source.
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Disadvantages• using electron beam lithography.• electronic switches and amplifiers.
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CONCLUSION•In this paper, we have proposed an ETDRNA for high speedoptical communication.
•The nano-antenna is composed of a‘Ag-SiO2-Ag’ structure.• •The antenna yields an impedance bandwidth of 2.58 % (192.5-197.3 THz).
•High directive radiation pattern of 8.6 dBi at 193.5 THz(1.55 um) with an end-fire pattern.
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REFERENCE
• www.hindawi.com.• Balanis, Constantine. "Antenna Theory: A Review",
Proceedings of the IEEE, vol. 80, January 1992.• Bharadwaj, P., Deutsch, B. & Novotny, L. Optical antennas.
Adv. Opt. Photon. 1, 438–483 (2009)
• www.youtube.com.
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THANK YOU