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Indonesian Journal of Physics (IJP)
Published by Institut Teknologi Bandung
ISSN : 23018151     EISSN : 29870828     DOI : https://doi.org/10.5614/itb.ijp
Core Subject : Science, Engineering,
Astronomy Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering
Indonesian Journal of Physics welcomes full research articles in the area of Sciences and Engineering from the following subject areas: Physics, Mathematics, Astronomy, Mechanical Engineering, Civil and Structural Engineering, Chemical Engineering, Electrical Engineering, Geotechnical Engineering, Engineering Science, Environmental Science, Materials Science, and Earth-Surface Processes. Authors are invited to submit articles that have not been published previously and are not under consideration elsewhere.
Arjuna Subject : Fisika dan Astronomi - Fisika Nuklir dan Molekuler, dan Ooptik
Articles 4 Documents
 1 
Search results for , issue "Vol 14 No 1 (2003): Vol. 14 No.1, Januari 2003" : 4 Documents clear
Band Structure of an Omnidirectional 1D Dielectric Gratings J. Prawiharjo; A.A. Iskandar; M.O. Tjia
Indonesian Journal of Physics Vol 14 No 1 (2003): Vol. 14 No.1, Januari 2003
Publisher : Institut Teknologi Bandung

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Abstract

The one-dimensional Photonic crystal has become an attractive subject of study in view of the recent experimental discovery of its omnidirectional reflectance implying the existence of complete photonic band gaps, which was believed to be possessed only by three-dimensional photonic crystals. This unexpected property has recently been explained numerically. In the present paper, the origin of such property is described and an approximate analytical expression is derived for the band edges of the photonic band gap. The results for some specific structures and materials are demonstrated, showing structures with 0.094% maximum error of the approximated result compared to the complete numerical result.
Chaotic properties of standing waves in a Kerr grating Arie Irman; Theo P Valkering
Indonesian Journal of Physics Vol 14 No 1 (2003): Vol. 14 No.1, Januari 2003
Publisher : Institut Teknologi Bandung

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Abstract

Helmholtz equations for a 1-d Kerr grating depend periodically on the propagation direction and their trajectories show irregular, 'chaotic' behavior. The usual Coupled Mode model for a shallow grating is derived from Helmholtz equations by an averaging procedure. They are autonomous and the (spatially) chaotic eects do not appear.Here we compare the predictions for standing monochromatic waves at the Bragg frequency in a multi-layer structure on the basis of the CM model, with those based on the original Helmholtz equation. A scaling result for the dimensions of the chaotic region in the phase plane is obtained in terms of the linear index contrast. Waves with period of the envelope of the order of the inverse squared of the index contrast show irregular features, primarily in phase.
Shallow Nonlinear Bragg Grating for High Intensity Application H. Alatas; A.A. Iskandar; M.O. Tjia
Indonesian Journal of Physics Vol 14 No 1 (2003): Vol. 14 No.1, Januari 2003
Publisher : Institut Teknologi Bandung

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Abstract

A study of shallow nonlinear Bragg grating with large intensity enhancement has been carried out using the standard couple mode theory. We show that for a sufficient intensity enhancement, the nonlinear modulation effect should not be neglected. We study the existence of gap solitons and show that the nonlinear modulation terms do affect their profiles.
The Effects of Sinusoidally Modulated Linear Refractive Index on The Wave Characteristics in Linear and Nonlinear Media Muksin Muksin; R.E. Siregar; A.A. Iskandar; M.O. Tjia
Indonesian Journal of Physics Vol 14 No 1 (2003): Vol. 14 No.1, Januari 2003
Publisher : Institut Teknologi Bandung

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Abstract

A numerical study has been carried out on the effects of shallow sinusoidal modulation on the refractive index of linear and nonlinear medium. The result on the linear system demonstrates generally the existence of a transmission band gap at acertain range of wavelength as usually revealed by analytic solution obtained with strictly nonreflecting boundary condition. It is shown in the numerical results that a more general boundary condition leads to similar transmission characteristics as the device length becomes much larger than the modulation period. A further description is given on the variation of gap characteristics with the system parameters. The extension by including the nonlinear term representing the intensity dependent refractive index (IDRI) effect gives rise to a new feature of the transmission gap, exhibiting imperfect reflection characterized by the appearance of transmission channels in the gap. As the input intensity increases, further modification of the gap feature occurs in conjunction with the appearance and growth of hysteretic effect featuring multistable states useful for logic functions. The variations of hysteretic characteristics with respect to the system parameters are also described.

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