Coupling strength control in photonic crystal/photonic wire multiple cavity devices

Zain, Ahmad Rifqi Md; Johnson, Nigel P.; Sorel, Marc; Rue, R.M. De La

doi:10.1049/el:20092814

Cited by 13 publications

(5 citation statements)

References 8 publications

(8 reference statements)

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“…For an initial design of the device, a basic photonic crystal hole arrangement was designed to have S F -6 holes, S MF -4 holes, S ME -4 holes and S E -6 holes-using similar hole radii and separated by equal cavity spacer lengths of The splitting of a single cavity resonance wavelength into three distinct resonance wavelengths was due to the number of cavities (three) specified in the structure [15,16].…”

Section: Resultsmentioning

confidence: 99%

Discrepancies in the free spectral range (FSR) of one-dimensional (1D) photonic crystal/photonic wire coupled-cavities

et al. 2020

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We present the simulation and experimental demonstration of a coupled-cavity 1D photonic-crystal/photonic-wire (PhC/PhW) structure that produces multiple resonance wavelengths. The combination of several cavities results in the assembly of a spectral response that exhibits multiple resonance wavelengths and potentially leads to the wavelength control required for wavelength division multiplexing (WDM) applications. By using a structure with three distinct in-line cavities, we have obtained three distinct resonance wavelengths—in conformity with the rule that the number of distinct resonance wavelengths is proportional to the number of cavities. The experimental photonic wire waveguide structure had cross-sectional dimensions of 600 nm (width) × 260 nm (height)—with an embedded photonic crystal (PhC) micro-cavity—all based on a silicon-on-insulator (SOI) platform. The embedded PhC structure was tailored to give resonance wavelengths in the C-band and L-band fiber telecommunication range. With the introduction of tapering in the multiple micro-cavity structure, it was possible to obtain three resonance wavelengths that correspond to WDM wavelengths of 1534.87, 1554.63 and 1594.86 nm—whereas, without tapering, the resonance wavelengths were 1645.60, 1670.76 and 1698.68 nm, respectively. We have observed an asymmetric free spectral range (FSR) situation with un-equal resonance wavelength spacing. The taper regions are also responsible for high optical transmission and lower Q-factor values at resonance. Transmission values of 0.17, 0.47 and 0.43 were obtained, together with Q-factor values of 1179.32, 930.05 and 970.35, respectively, without using tapered sections—while transmission values of 0.45, 0.74 and 0.43 were obtained, together with Q-factor values of 1083.24, 850.10 and 885.22, respectively, using tapered sections. (The normalisation values for the experiments were obtained with respect to an unstructured photonic wire). We have demonstrated that the taper structures used must be designed accurately, in order to maximize the transmission values at the desired resonance wavelengths. The demonstration of fabricated device structures that have measured properties that are in close agreement with predictions obtained using finite-difference time-domain (FDTD) computational software is an indication of the precision of the fabrication process. With the introduction of multiple cavities into the structures realised, the number of resonance wavelengths can be tailored for application as WDM components or other wavelength selective filters, such as arrayed-waveguide grating structures (AWGs) and Bragg gratings.

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Section: Resultsmentioning

confidence: 99%

Discrepancies in the free spectral range (FSR) of one-dimensional (1D) photonic crystal/photonic wire coupled-cavities

et al. 2020

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“…When more complex structures involving two micro-cavities or double-cavity structures were introduced, significantly lower Q-factor values resulted [13][14][15]. The coupled-cavity resonance splitting behavior was observed to depend on the detailed features of the cavities introduced within the total structure [11,13].…”

Section: Introductionmentioning

confidence: 98%

“…The high Q-factor values for the microcavity resonances were achieved through the use of a mode-matching approach -by making use of different hole sizes and aperiodic positioning of the holes [9]. The light confinement in such micro-cavities can also be characterized using a classical Fabry-Perot model, in which a guided Bloch mode in a PhC waveguide bounces between the two mirrors that form the micro-cavity [10][11][12]. When more complex structures involving two microcavities or double-cavity structures were introduced, significantly lower Q-factor values resulted [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…The light confinement in such micro-cavities can also be characterized using a classical Fabry-Perot (FP) model, in which a guided Bloch mode in a PhC waveguide bounces between the two mirrors that form the micro-cavity [10][11][12]. When more complex structures involving two micro-cavities or double-cavity structures were introduced, significantly lower Q-factor values resulted [13][14][15]. The coupled-cavity resonance splitting behavior was observed to depend on the detailed features of the cavities introduced within the total structure [11,13].…”

Section: Introductionmentioning

confidence: 99%

“…The impact of the number of periodically spaced mirror holes, N m , in each mirror section on the high Qfactor resonance that we have reported previously in [8] is further investigated, after the introduction of two cavities within the outside mirrors, as shown in figure 1. In comparison with our previously reported results [13], more complete investigation has been carried out-in order to identify the effects of using different combinations of periodic and aperiodic hole structures in the middle, coupling, section of the coupled-cavity structure. The central mirror section separates the two micro-cavities, c 1 and c 2 , as shown in figure 1.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Control of coupling in 1D photonic crystal coupled-cavity nano-wire structures via hole diameter and position variation

Zain

Rue

2015

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Photonic crystal devices: some basics and selected topics

Rue

Seassal

2012

Laser & Photonics Reviews

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This review article is concerned with basic aspects and some selected topics in photonic crystal (PhC) devices. It starts with a significantly historical aspect of basic principles for photonic crystals that it is hoped will help the reader to develop a critical appreciation of the research literature. It continues by describing topics such as PhC beamsplitters, slow‐light structures, micro‐/nanoresonators, coupled resonator optical waveguides (CROWs) and PhC‐based semiconductor lasers. Emphasis is placed on both the conceptual and the practical matters that need to be addressed in order to fulfill the tasks of designing and realizing devices that exploit photonic crystal principles. The review also addresses some of the problems encountered in the fabrication of photonic crystal devices using the planar technologies of integrated photonics, which are those that are most likely to be used in future commercial production.

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Coupling strength control in photonic crystal/photonic wire multiple cavity devices

Cited by 13 publications

References 8 publications

Discrepancies in the free spectral range (FSR) of one-dimensional (1D) photonic crystal/photonic wire coupled-cavities

Discrepancies in the free spectral range (FSR) of one-dimensional (1D) photonic crystal/photonic wire coupled-cavities

Control of coupling in 1D photonic crystal coupled-cavity nano-wire structures via hole diameter and position variation

Photonic crystal devices: some basics and selected topics

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