Accepted and Presented Articles of OPSI Conferences
مقالات پذیرفته و ارائه شده در کنفرانسهای انجمن اپتیک و فوتونیک ایران
ICOP & ICPET _ INPC _ ICOFS
Basic Sciences
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8888
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1394
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gregorian
2016
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مجموعه مقالات پذیرفته و ارائه شده در بیست و دومین کنفرانس اپتیک و فوتونیک ایران
online
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Determination of Optical Properties of Plasmonic Cuboid Nanoparticles Using Off-Center Polarizability
Determination of Optical Properties of Plasmonic Cuboid Nanoparticles Using Off-Center Polarizability
تخصصی
Special
پژوهشي
Research
<p>In the present paper a modified semi-analytical approximate method for determination of polarizability and ultimately optical properties of cuboid nanoparticles for different incident polarizations is suggested. Except sphere, in other particles depolarization factor strongly continents on the position of the point inside the particle. Each point represents an electric point-dipole, approximately defining the optical response of the nanoparticle in quasistatic regime. Using the near field distribution inside a cuboid nanoparticle the proper off-center point as representative of the whole shape is determined. Actually in this point electric field has a mean value and depolarization factors of it could predict the optical properties of nanoparticles properly. For perpendicular polarization because of the weak dependency of the electric polarizability to the considered dimensions, center point polarizability is still a good candidate for determination of the optical properties. However, as the height of cuboid increases the deserving point moves toward the top/down surface for parallel polarization. Interestingly, assigned the point-dipole at this off-center point can predict the optical properties of the considered plasmonic nanocuboid with a good approximation. This point-dependent (PD) MLWA technique could be generalized to different nanoparticles with an irregular shape.</p>
<p>In the present paper a modified semi-analytical approximate method for determination of polarizability and ultimately optical properties of cuboid nanoparticles for different incident polarizations is suggested. Except sphere, in other particles depolarization factor strongly continents on the position of the point inside the particle. Each point represents an electric point-dipole, approximately defining the optical response of the nanoparticle in quasistatic regime. Using the near field distribution inside a cuboid nanoparticle the proper off-center point as representative of the whole shape is determined. Actually in this point electric field has a mean value and depolarization factors of it could predict the optical properties of nanoparticles properly. For perpendicular polarization because of the weak dependency of the electric polarizability to the considered dimensions, center point polarizability is still a good candidate for determination of the optical properties. However, as the height of cuboid increases the deserving point moves toward the top/down surface for parallel polarization. Interestingly, assigned the point-dipole at this off-center point can predict the optical properties of the considered plasmonic nanocuboid with a good approximation. This point-dependent (PD) MLWA technique could be generalized to different nanoparticles with an irregular shape.</p>
Polarizability, Depolarization factors, Irregular shape, Cuboid nanoparticles, PD-MLWA.
Polarizability, Depolarization factors, Irregular shape, Cuboid nanoparticles, PD-MLWA.
974
977
http://opsi.ir/browse.php?a_code=A-10-1-985&slc_lang=en&sid=1
Atefe
Fazel Najafabadi
Atefe
Fazel Najafabadi
a.fazel@ee.kntu.ac.ir
10031947532846004400
10031947532846004400
No
Faculty of Electrical Engineering, K. N. Toosi University of Technology
Faculty of Electrical Engineering, K. N. Toosi University of Technology
Tavakol
Pakizeh
Tavakol
Pakizeh
pakizeh@eetd.kntu.ac.ir
10031947532846004401
10031947532846004401
Yes
Faculty of Electrical Engineering, K. N. Toosi University of Technology
Faculty of Electrical Engineering, K. N. Toosi University of Technology