Bintoro Siswo Nugroho - Academia.edu (original) (raw)

Papers by Bintoro Siswo Nugroho

Jurnal Fisika, May 31, 2023

Nucleation and Atmospheric Aerosols, 2023

Journal of Optics, Dec 12, 2016

We theoretically investigate the nonlinear optical response of a heterodimer comprising a semicon... more We theoretically investigate the nonlinear optical response of a heterodimer comprising a semiconductor quantum dot strongly coupled to a metal nanoparticle. The quantum dot is considered as a three-level ladder system with ground, one-exciton, and biexction states. As compared to the case of a two-level quantum dot model, adding the third (bi-exciton) state produces fascinating effects in the optical response of the hybrid system. Specifically, we demonstrate that the system may exhibit picosecond and subpicosecond self-oscillations and quasi-chaotic behaviour under single-frequency continuous wave excitation. An isolated semiconductor quantum dot does not show such features. The effects originate from competing one-exciton and bi-exciton transitions in the semiconductor quantum dot, triggered by the self-action of the quantum dot via the metal nanoparticle. The key parameter that governs the phenomena mentioned is the ratio of the self-action strength and the bi-exciton shift. The self-oscillation regime can be achieved in practice, in particular, in a heterodimer comprised of a closely spaced ZnS/ZnSe core-shell quantum dot and a spherical silver nanoparticle. The results may have applications in nanodevices for generating trains of ultrashort optical pulses.

Computational And Experimental Research In Materials And Renewable Energy, 2021

The properties of GaAs material in zinc blende type was calculated using Hiroshima Linear Plane W... more The properties of GaAs material in zinc blende type was calculated using Hiroshima Linear Plane Wave program based on the Density Functional Theory. This calculation aims to determine electronic properties of GaAs material are based on Density of States and energy band structure. This simulation’s results are DOS shows that hybridization of s orbital of Ga with s orbital of As provides covalent properties. The simulation of energy band structure from GaAs material indicates that semiconductor properties of GaAs is direct band gap. The energy band gap results obtained for GaAs is 0.80 eV. The computational result of the energy band gap calculation form HiLAPW has better accuracy and prediction with good agreement within reasonable acceptable errors when compared to some other DFT programs and the results of the experimental obtained.

2013 7th International Congress on Advanced Electromagnetic Materials in Microwaves and Optics, 2013

ABSTRACT We study theoretically the optical response of a hybrid system comprised of a dimer coup... more ABSTRACT We study theoretically the optical response of a hybrid system comprised of a dimer coupled to a metal nanoparticle. The intermolecular coupling between molecules J and the dimer-MNP coupling G drive the optical response of the hybrid. We found that, for certain combinations of J and G, optical bistability can occur.

Physical Review B, 2019

Tho-photon Rabi oscillations hold potential for quantum computing and quantum information process... more Tho-photon Rabi oscillations hold potential for quantum computing and quantum information processing, because during a Rabi cycle a pair of entangled photons may be created. We theoretically investigate the onset of this phenomenon in a heterodimer comprising a semiconductor quantum dot strongly coupled to a metal nanoparticle. Two-photon Rabi oscillations in this system occur due to a coherent two-photon process involving the ground-to-biexciton transition in the quantum dot. The presence of a metal nanoparticle nearby the quantum dot results in a self-action of the quantum dot via the metal nanoparticle, because the polatization state of the latter depends on the quantum state of the former. The interparticle interaction gives rise to two principal effects: (i)-enhancement of the external field amplitude and (ii)-renormalization of the quantum dot's resonance frequencies and relaxation rates of the off-diagonal density matrix elements, both depending on the populations of the quantum dot's levels. Here, we focus on the first effect, which results in interesting new features, in particular, in an increased number of Rabi cycles per pulse as compared to an isolated quantum dot and subsequent growth of the number of entangled photon pairs per pulse. We also discuss the destructive role of radiative decay of the excitonic states on two-photon Rabi oscillations for both an isolated quantum dot and a heterodimer.

Journal of physics, Feb 1, 2021

We theoretically study two-photon Rabi oscillations (TPRO) in a nanocomposite comprising a semico... more We theoretically study two-photon Rabi oscillations (TPRO) in a nanocomposite comprising a semiconductor quantum dot (SQD) strongly coupled to a metallic nanoshell (MNS), which undergoes a pulsed excitation. The SQD is modeled as a three-level ladder-like quantum system (ground, one-exciton, and bi-exciton states). Its optical dynamics is described quantum-mechanically within the density matrix formalism framework, while the MNS is treated classically through its frequency-dependent polarizability. We find two effects of the presence of a MNS in close proximity to the SQD: (a) - a sufficient increase of the number of Rabi cycles as compared to the case of an isolated SQD and (b) - incoherent population of the one-exciton state giving rise to the destruction of the TPRO.

Journal of Physics: Conference Series, 2021

We performed molecular dynamics calculation to study hydrogen molecules’ diffusion in the voids o... more We performed molecular dynamics calculation to study hydrogen molecules’ diffusion in the voids of C2 hydrogen hydrate with varied occupancy at 291K and 4GPa. The same hydrate systems under pressure conditions of 76MPa to 174.2MPa at 77K to 150K were also investigated. LAMMPS molecular dynamics program is employed to the 3×3×3 unit cells with periodic boundary conditions of C2 hydrogen hydrate. TIP4P/Ice and three sites were used to model water molecules and the encapsulated hydrogen gas, respectively. The whole system was simulated for 10ns. The diffusion coefficient calculations show conformity with the experimental results, with the highest of 9.07 × 10−9 cm2s−1 shown by a system of 80% hydrogen gas occupancy under 291K and 4GPa of temperature and pressure, respectively. Hydrogen gases are actively diffuse between voids in every simulated system configuration.

Physical Review B, 2020

Tho-photon absorption holds potential for many practical applications. We theoretically investiga... more Tho-photon absorption holds potential for many practical applications. We theoretically investigate the onset of this phenomenon in a semiconductor quantum dot-metallic nanoshell composite subjected to a resonant CW excitation. Two-photon absorption in this system may occur in two ways: incoherent-due to a consecutive ground-to-one-exciton-to-biexciton transition and coherent-due to a coherent two-photon process, involving the direct ground-to-biexciton transition in the quantum dot. The presence of the nanoshell nearby the quantum dot gives rise to two principal effects: (i)-renormalization of the applied field amplitude and (ii)-renormalization of the resonance frequencies and radiation relaxation rates of the quantum dot, both depending on the the quantum dot level populations. We show that in the perturbation regime, when the excitonic levels are only slightly populated, each of these factors may give rise to either suppression or enhancement of the two-photon absorption. The complicated interplay of the two determines the final effect. Beyond the perturbation regime, it is found that the two-photon absorption experiences a drastic enhancement, which occurs independently of the type of excitation, either into the one-exciton resonance or into the two-photon resonance. Other characteristic features of the two-photon absorption of the composite, emerging from the coupling between both nanoparticles, are bistability and self-oscillations.

Jurnal Edukasi dan Penelitian Informatika (JEPIN)

Penyakit retinopati diabetik dan retinopati hipertensi dapat menyebabkan terjadinya kelainan vask... more Penyakit retinopati diabetik dan retinopati hipertensi dapat menyebabkan terjadinya kelainan vaskular pada pembuluh darah retina. Kelainan ini menimbulkan pola-pola unik yang muncul pada citra fundus mata dan memberikan ciri pada dimensi fraktal dan lakunaritas citra tersebut. Dalam studi ini, nilai dimensi fraktal dan lakunaritas citra fundus mata ditelaah dan dijadikan sebagai parameter pengelompokan data dengan metode k-means clustering untuk identifikasi penyakit retinopati diabetik dan retinopati hipertensi. Sebelum analisis dilakukan, citra fundus mata terlebih dahulu melalui tahap preprocessing agar dapat diolah lebih lanjut. Penghitungan dimensi fraktal dilakukan dengan metode box counting dan lakunaritas dihitung dengan metode gliding box. Pengelompokan data dengan metode k-means dilakukan dengan algoritma Lloyd. Hasil yang diperoleh menunjukkan bahwa metode yang digunakan memiliki akurasi sebesar 96.67%, dengan 29 identifikasi benar dari 30 data masukan yang diberikan. Has...

Jurnal Riset Fisika Edukasi dan Sains

A study was performed to analyze the sound intensity level and physical properties of a composite... more A study was performed to analyze the sound intensity level and physical properties of a composite board made from oil palm empty fruit bunch (OPEFB) particles mixed with polyvinyl acetate (PVAc) adhesive. The composite boards were fabricated with various concentrations of adhesive, namely 8%, 10%, 12%, 14%, and 16%. The intensity level was measured at sound wave frequencies of 125 Hz, 250 Hz, 500 Hz, 1000 Hz, 2000 Hz, and 4000 Hz. The results showed that the highest sound intensity level, 74,2 dB at a frequency of 500 Hz, was found in the composite board with an 8% adhesive concentration. This composite board is categorized as a low-density composite board. The lowest sound intensity level, 58,6 dB at a frequency of 125 Hz, was found in the composite board produced with 16% adhesive concentration. This composite board is categorized as a high-density composite board. The physical property test results for all adhesive concentration variations showed that the resulting composite boar...

JURNAL ILMU FISIKA | UNIVERSITAS ANDALAS

study aims to see the effect of adding TiO2 on activated carbon as a material for reducing CO and... more study aims to see the effect of adding TiO2 on activated carbon as a material for reducing CO and HC gas emissions. Activated carbon (AC) was synthesized from orange peel waste at a carbonization temperature of 600 with a 10% (w/v) ZnCl2 activator. Composite AC/TiO2 was prepared by a simple mixing method. This process obtained TiO2-modified activated carbon material with variations in TiO2 concentrations of 0%, 10%, 15%, 20%, and 25%. Scanning Electron Microscope (SEM) was performed to obtain information on the AC/TiO2 surface morphology. In the application as a CO and HC gas emission reduction material, the results of mixing AC/TiO2 are mixed with a 10% (w/v) solution of Polyvinyl Alcohol (PVA) as an adhesive and molded in the shape of a filter with two variations hole sizes with a diameter of 1 cm and 0.3 cm. Composite filter performance tests were carried out using a gas analyzer. The best result for reducing gas emissions occurred at a concentration of TiO2 15% with reduction p...

POSITRON

Using molecular dynamic simulation, we developed an algorithm to protonate the surface of an amor... more Using molecular dynamic simulation, we developed an algorithm to protonate the surface of an amorphous porous silica grain particle model and study its effect. In this work, the silica grain model can be used to study cosmic dust coagulation. The surface of the silica cluster was protonated by placing H atoms on oxygen atoms having only a single bond, namely, the non-bridging oxygens. The H atoms are placed opposite the Si–O bond with a distance of around 1 Å to form silanol (Si–O–H) group termination on the silica surface. The angular conformation of the silanol was optimized by relaxing the surface at low temperature. We evaluated the number of silanol groups, the angular distribution of the Si-O-H bond, and the average distance between Si-O particles using the radial distribution function (RDF). The result of the study shows that minimizing the energy of the silica surface changes the angular distribution of the silanol from 180° to about 110° and between 140°-160°. However, the ...

Telah dilakukan kajian eksperimental osilasi pendulum fisis dengan massa berubah untuk menganalis... more Telah dilakukan kajian eksperimental osilasi pendulum fisis dengan massa berubah untuk menganalisis pengaruh perubahan massa pendulum fisis terhadap gerak pendulum tersebut. Pendulum fisis terbuat dari pipa PVC yang ditutup di bagian bawahnya dan massanya dapat divariasikan dengan memasukkan sejumlah air ke dalam pipa tersebut. Analisis data dilakukan menggunakan bantuan perangkat lunak tracker. Laju air yang keluar dari pipa dapat dihitung menggunakan pendekatan yang diperoleh melalui bantuan perangkat lunak excel. Nilai momen inersia air pada pendulum dihitung menggunakan teorema sumbu sejajar dengan mensubstitusikan persamaan laju air yang keluar dari pendulum. Faktor redaman berbanding terbalik dengan pertambahan massa pendulum.Kata kunci : pendulum fisis, osilasi, tracker, momen inersia, teorema sumbu sejaja

Telah dilakukan penelitian mengenai rancang bangun alat ukur kualitas air berdasarkan pH dan keke... more Telah dilakukan penelitian mengenai rancang bangun alat ukur kualitas air berdasarkan pH dan kekeruhan air. Sensor pH SKU SEN0161 dan sensor kekeruhan SKU SEN0189 dihubungkan ke mikrokontroler ESP32. Hasil pengukuran ditampilkan pada LCD secara real time dan dapat di monitoring menggunakan web browser dengan menggunkan modul wifi yang telah termasuk kedalam chip ESP32. Masing masing sensor dikalibrasi dengan alat ukur referensi yang bertujuan untuk mengubah nilai keluaran analog sensor menjadi nilai yang memiliki satuan serta membuat alat ukur yang dibuat menjadi lebih akurat. Persamaan kalibrasi untuk sensor pH adalah y = 0,9058x – 5,8108, sedangkan untuk sensor kekeruhan persamaan kalibrasinya yaitu y = 156,98x2 - 1436,1x + 3253. Untuk sensor pH, nilai koefisien error RMS sebesar 0,262 dan error rata-rata sebesar 3,52% sehingga tingkat akurasi sensor pH alat ukur sebesar 96,48%. Untuk sensor kekeruhan, nilai koefisien error RMS sebesar 2,216 dan error rata-rata sebesar 2,35% sehin...

Penelitian ini mengkaji identifikasi pola kain tenun corak insang pontianak menggunakan metode ge... more Penelitian ini mengkaji identifikasi pola kain tenun corak insang pontianak menggunakan metode geometri fraktal serta replikasi dan modifikasi pola tersebut dengan penjumlahan fungsi periodik. Tahap pertama proses identifikasi dilakukan dengan menyimpan pola kain tenun pada citra digital. Citra tersebut kemudian dikonversi dalam represantasi grayscale dan disegmentasi dengan proses thresholding untuk menghasilkan citra biner. Karakterisasi pola dilakukan dengan menghitung dimensi fraktal dan lakunaritas citra biner. Sedangkan, replikasi pola dilakukan dengan menggambar dan merotasi fungsi gergaji (sawtooth wave). Modifikasi pola dilakukan melalui penjumlahan beberapa fungsi periodik. Pola yang dihasilkan dari proses replikasi dan modifikasi diidentifikasi kembali dengan metode fraktal untuk menentukan karakteristiknya. Dari kajian yang dilakukan, diketahui bahwa metode yang telah diterapkan dapat menghasilkan motif pola kain tenun corak insang pontianak yang lebih beragam namun teta...

Telah dilakukan simulasi mengenai respons optik nanopartikel paduan logam mulia berdasarkan aprok... more Telah dilakukan simulasi mengenai respons optik nanopartikel paduan logam mulia berdasarkan aproksimasi kuasi-statik elektromagnetika klasik. Penentuan spektrum serapan bahan logam (Qabs) digunakan untuk mengetahui efisiensi kinerja bahan logam. Logam yang digunakan diantaranya emas (Au), perak (Ag), tembaga (Cu) dan tungsten (W). kinerja bahan yang ditinjau meliputi logam murni, logam paduan Au-Ag, Au-Cu, Au-W, Ag-Cu, Ag-W dan Cu-W. Nilai logam murni yang paling tinggi adalah perak (Ag) sedangkan logam paduan bergantung dari jenis logam yang dipadukan diantaranya Au-Ag, Ag-Cu dan Ag-W kadar ketercampuran perak sangat mempengaruhi peningkatan kinerja bahan logam paduan, nilai kinerja tertinggi yaitu fraksi molar perak sama dengan 0,8; untuk logam paduan Au-Cu ketercampuran bahan hampir sama rata di mana nilai serapan berada pada fraksi molar 0,4 dan 0,6; untuk logam paduan Au-W ketercampuran bahan emas sangat mempengaruhi kinerja bahan di mana nilai kinerja tertinggi yaitu fraksi mo...

In dit proefschrift onderzoeken we de optische respons van nanohybriden, bestaande uit een kwantu... more In dit proefschrift onderzoeken we de optische respons van nanohybriden, bestaande uit een kwantum-straler op korte afstand van een bolvormig metalen nanodeeltje (MND), in wisselwerking met licht. Eerst beschouwen wij een systeem samengesteld uit een halfgeleider kwantumpunt (HKP) dat is gekoppeld aan een gouden MND. Er wordt aangetoond dat deze koppeling, gekenmerkt door een complexe parameter, aanleiding geeft tot bistabiliteit van de optische respons van de hybride. De reele en imaginaire delen van de koppelingsparameter leiden tot twee verschillende bistabiliteitsmechanismen. We bestuderen ook de tijdsafhankelijke respons van het systeem, wat cruciaal is om het potentiele nut van zulke systemen als bouwstenen voor echte apparaten te beoordelen. Voorts bestuderen wij een symmetrisch dimeer (DIM), gekoppeld aan een zilveren MND. Het dimeer bestaat uit twee molekulen, wat effectief neerkomt op een optisch drie-niveau laddersysteem. Naast bistabiliteit leidt de DIM-MND koppeling tot...

This study examines the effect of nanosilica addition to the physical and mechanical properties o... more This study examines the effect of nanosilica addition to the physical and mechanical properties of sugar palm fibers (SPFs) reinforced cement composite concrete. The composite concrete ingredients are SPFs as the filler, cement and nano-silica as the matrix, CaCl2 as the catalyst, and water. Testing and fabrication of the composite concrete were performed according to the standard of ASTM C 1185 and ASTM C 1186. The results obtained show that, in general, the addition of nanosilica improves the quality of the composite concrete. A positive effect is attained by adding nanosilica to its optimum amount. The excessive addition of nanosilica reduces the quality of the composite. The composite's mechanical property that is negatively affected by the addition of the nanosilica is the elasticity, in which more nanosilica added stiffer the composite.