Juliasih Partini, Juliasih
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Simulasi Aljabar Bra-ket dengan Scilab Partini, Juliasih; Nuruddinsyah, Muhammad Faruq; Hidayat, Mirzanur
Omega: Jurnal Fisika dan Pendidikan Fisika Vol 1, No 1 (2015)
Publisher : Omega: Jurnal Fisika dan Pendidikan Fisika

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Abstract

Simulasi interaktif sederhana aljabar bra-ket dengan menggunakan Scilab telah dibuat. Simulasi digunakan sebagai alat bantu dalam pembelajaran dasar-dasar mekanika kuantum bagi mahasiswa. Cakupan simulasi berisi penentuan bra ⟨ψ| dan ⟨φ|, serta bra-ket ⟨ψ|ψ⟩, ⟨φ|φ⟩, ⟨ψ|φ⟩, dan ⟨φ|ψ⟩ dari sembarang masukan ket |ψ⟩ dan ket |φ⟩. Ket dalam bentuk matriks kolom, riil atau kompleks. Kata kunci: simulasi, bra-ket, Scilab.
Kajian Gejala Penyearahan Optik pada Metamaterial Chiral Partini, Juliasih; Abraha, Kamsul; Hermanto, Arief; Tomita, Satoshi; Takahiro, Matsui
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 4, No 02 (2014): IJAP Volume 04 Issue 02 Year 2014
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v4i02.4980

Abstract

Chiral metamaterial is a new breakthrough in the fabrication of a metamaterial because of the capability of providing different refractive index values for each circular polarization angle. This provides opportunities to obtain negative refractive index values, without the necessity to have simultaneously negative values for both permittivity and permeability. This study investigated the optical rectification, which is the phenomenon of second order non-linear optics in the chiral metamaterial. This relates to the testing of the new designs of square structure chiral metamaterial. Optical rectification is often used to rectify femtoseconds laser from the realm of visible light into the terahertz domain. Nonlinear response of metamaterial was observed by terahertz emission spectroscopy. The results showed that the obtained terahertz signal is proportional to the square of the laser power used. This suggests that in theincoherent optical rectification, there is a mixture of optical rectification with the second harmonic wave generation. Development of square-structured chiral metamaterials is expected to be an alternative source of material due to the lack of non-linear material that can be used in the terahertz domain.
Efek Circular Dichroism pada Metamaterial Chiral Planar Partini, Juliasih
Risalah Fisika Vol 2, No 2 (2018): Risalah Fisika ISSN 2548-9011
Publisher : Physical Society of Indonesia (PSI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (67.807 KB) | DOI: 10.35895/rf.v2i2.113

Abstract

Abstrak – Penelitian ini mengkaji efek circular dichroism pada metamaterial chiral planar. Bidang polarisasi akan terotasi ketika cahaya yang terpolarisasi linear melewati metamaterial chiral planar. Pada efek circular dichroism, cahaya yang terpolarisasi circular putaran kanan dan putaran kiri akan mempunyai perbedaan absorpsi dalam interaksinya dengan partikel penyusun metamaterial chiral planar. Spektrum eliptisitas metamaterial chiral planar menunjukkan eliptisitas bahan yang bernilai positif untuk sampel putar kanan dan bernilai negatif untuk sampel putar kiri. Nilai eliptisitas diperoleh sebesar maksimal +0,3 dan -0,3 terjadi pada frekuensi 1,29 THz. Eliptisitas maksimum menunjukkan adanya kopling antara foton dengan plasmon permukaan sampel. Polaritas yang berlawanan menunjukkan perbedaan absorbansi antara sampel putar kanan dan sampel putar kiri. Hasil tersebut juga menunjukkan adanya perubahan polarisasi linear pada laser femtosekon menjadi polarisasi eliptik pada  gelombang THz hasil emisi sampel metamaterial chiral planar. Kemampuan metamaterial chiral planar dalam memutar bidang polarisasi dan merubah menjadi polarisasi circular menjadikan bahan ini layak dijadikan alternatif polarisator dalam ranah terahertz.  Kata kunci: metamaterial, circular dichroism, chirality, polarisasi, eliptisitasAbstract – This paper describes the circular dichroism effect on planar chiral metamaterial. When a linearly polarized light passes through the planar chiral metamaterial, its polarization plane will rotate. On the circular dichroism effect, the right and left circulary polarized light will have different absorption due to its interaction with a planar chiral metamaterial. The ellipticity spectrum of a planar chiral metamaterial sample shows a positive ellipticity value for the counter clock-wise sample and a negative value for the clock-wise sample. The maximum ellipticity value is determine as +0,3 and -0,3 at frequency of 1,29 THz. The values show the existence of a coupling between photon and the sample surface plasmon. The opposite polarity indicates that the clock-wise and the counter clock-wise sample have different absorbance. The determined ellipticity value also reveals that the linearly polarized femtosecond laser light has transformed to elliptical polarized THz wave on a planar chiral metamaterial sample emission. The planar chiral metamaterial capability to rotate the polarization plane into circulary polarized wave, makes the material can be considered as an alternative polarizer in terahertz field.  Key words: metamaterial, circular dichroism, chirality, polarization, ellipticity