Analisis Respon Optik Nanopartikel Berbentuk Bola Berlapis Non-Konsentris dengan aproksimasi Quasi-Static
DOI:
https://doi.org/10.26418/pf.v10i1.53433Abstract
Telah dilakukan simulasi mengenai respons optik pada nanopartikel logam berbentuk bola berlapis dengan pendekatan quasi-static. Inti dari nanopartikel logam berlapis dianggap memiliki konstanta dielektrik yang sama dengan konstanta dielektrik lingkungan sehingga inti menjadi sebuah rongga di dalam nanopartikel berbentuk bola. Rongga di dalam nanopartikel berbentuk bola logam bisa diatur posisinya sehingga dapat menghasilkan bentuk nanopartikel logam berlapis dengan inti yang tidak konsentris terhadap lapisannya. Spektrum hamburan logam sangat dipengaruhi oleh pergeseran rongga di dalam nanopartikel. Ketika rongga berada pada posisi yang konsentris, spektrum yang hasilkan adalah spektrum dengan profil simetris atau profil Lorenztian, tetapi saat rongga berada pada posisi yang tidak konsentris, muncul spektrum baru yang memiliki bentuk asimetris atau dikenal dengan profil Fano. Kuat lemahnya spektral Fano yang dihasilkan juga sangat bergantung pada besarnya nilai pergeseran rongga didalam nanopartikel. Nilai pergeseran rongga yang semakin besar membuat spektral Fano semakin melemah.
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Date: 24-05-2023
Prisma Fisika
Email: prismafisika@physics.untan.ac.id
