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

Zain, Ahmad Rifqi Md; Rue, R.M. De La

doi:10.1088/2040-8978/17/12/125007

Cited by 10 publications

(6 citation statements)

References 16 publications

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“…The present study shows that the introduction and control of the taper sections [3,11] results in a high Q-factor at the designed wavelength, which makes this design potentially suitable for multiple-wavelength device applications. Previous work has shown that having more than a single cavity in a 1D PhC/PhW structure leads to splitting of the resonance wavelengths, in accordance with the number of cavities [12].…”

Section: Introductionmentioning

confidence: 77%

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: Introductionmentioning

confidence: 77%

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

et al. 2020

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“…Finite-difference time-domain (FDTD) simulations using commercial software have been carried out, as also reported in [30,31]. The reflectivity of the mirrors in this particular device increased significantly as the number of periodically spaced holes in the mirrors increased.…”

Section: Design and Fdtd Simulations Approachmentioning

confidence: 98%

“…The mirrors were separated by a short cavity length, L C of 400 nm. In order to reduce the modal mismatch between the unpatterned PhW waveguide and the cavity section -and, within the cavity, the mismatch between the Bragg mirrors and the cavity spacer section, optimized hole tapers based on previous work [30,31] were used. The structures consist of four aperiodically spaced and tapered hole sections at either end of the cavity, N TOand four aperiodically spaced hole taper sections within the cavity, N TI .…”

Section: Design and Fdtd Simulations Approachmentioning

confidence: 99%

“…A variety of different design configurations for achieving high quality factor values have been described in the literature -such as micro-pillars [22][23][24], silica toroids [25], PhC cavities [26][27][28][29][30][31] in photonic wire waveguides -and cavities based on 2D PhC membrane structures [32,33]. Q-factor values as large as 10 8 have been obtained in silica toroids [34], but their structure has a relatively large modal volume.…”

Section: Introductionmentioning

confidence: 99%

“…The interest in manufacturing ultra small microcavity device structures has been boosted by the possibility of achieving modal volumes that are comparable with the notional limiting value of V = (λ/2n) 3 [35]. Based on this motivation, high Q-factor values, greater than 10 6 , have been achieved [36,37,38] -as well as in other configurations such as 1D PhC micro-cavities [28][29][30][31]39], L3 cavities within 2D PhC environments -where three holes in a line are removed to provide a micro cavity [40] -and also heterostructure microcavities [41,42]. Our design has demonstrated the large enhancement in the Q-factor that is achievable for light confined within a small volumethrough the use of the mode matching mechanism where the light with mode profile matching propagates smoothly from the unpatterned waveguide into the periodic section, as discussed in detail in [18,19].…”

Section: Introductionmentioning

confidence: 99%

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Enhancement and reproducibility of high quality factor, one-dimensional photonic crystal/photonic wire (1D PhC/PhW) microcavities

Nawi

Majlis

Mahdi

et al. 2018

J. Eur. Opt. Soc.-Rapid Publ.

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Background: The production of compact and multi-functional photonic devices has become a topic of major research activity in recent years. Devices have emerged that can be used for functional requirements in high speed optical data processing, filtering, nonlinear optical functions such as all-optical switching -and many other applications. The combination of photonic crystal (PhC) structures consisting of a single row of holes embedded in a narrow photonic wire (PhW) waveguide realised in high index-contrast materials is a possible contender for provision of a range of compact devices on a single chip. This trend has been motivated by the availability of a silicon technology that can support monolithic integration to form fully functional devices on CMOS chips. Results: We have successfully demonstrated experimentally an enhancement of the quality factor of a one-dimensional (1D) photonic crystal/photonic wire (PhC/PhW) microcavity that can exhibit resonance quality factor (Q-factor) values as high as 800,000 -together with a low modal volume of approximately 0.5 (λ/n) 3 . These results are based on the use of a mode matching approach previously used for device design -through the engineering of tapered hole sections within and outside the cavity -and were achieved without removing the silica cladding layer below the silicon waveguide core. The simulation results obtained in this case also agree with the experimental results obtained. Conclusions:In this work we have demonstrated that the mode matching, as light enters the photonic crystal structure, can be further enhanced through the use of careful fine tuning of the third hole, t 3 of the tapered hole region outside the cavity. The Q-factor value obtained was approximately four times greater than that achieved in our previous work on a similar structure.

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Highly Sensitive Optofluidic Sensor of 2D Si PhC L3 Cavity for Detection of Glucose and Bovine Serum Albumin

Rahmasari

Abdullah

Zain

et al. 2022

Silicon

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

Cited by 10 publications

References 16 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

Enhancement and reproducibility of high quality factor, one-dimensional photonic crystal/photonic wire (1D PhC/PhW) microcavities

Highly Sensitive Optofluidic Sensor of 2D Si PhC L3 Cavity for Detection of Glucose and Bovine Serum Albumin

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