Wideband slab photonic crystal waveguides for slow light using differential optofluidic infiltration

Khodamohammadi, Amir; Khoshsima, Habib; Fallahi, Vahid; Sahrai, Mostafa

doi:10.1364/ao.54.001002

Cited by 9 publications

(2 citation statements)

References 52 publications

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“…Apart from these approaches, researchers have continued to perform studies that explore basic photonic crystal waveguide (PCW) structures. PCWs subject to various different modifications were studied to enhance slow wave performance of propagating light pulses (Moghaddam & Fleury, 2019;Hocini et al 2018;Schulz et al 2017;Han et al 2015;Varmazyari et al 2014;Khodamohammadi et al 2015).…”

Section: Introduction and Dispersion Relations Of Proposed Elliptic Photonic Crystalsmentioning

confidence: 99%

Slow-light effect in symmetry-reduced non-defect photonic crystals

Giden

2022

Turkish Journal of Engineering

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In this study, a two-dimensional low-symmetric photonic crystal (PC) configuration with elliptical geometry is presented and its slow-light (SL) effect is investigated. Reducing the symmetry in the PC unit cell provides slow modes at the higher transverse electric bands. The calculated group index and the corresponding normalized bandwidth equal to {ng, BW}={63.56, 0.0065}. That corresponds to a value of figure of merit (FOM)=0.4344 defined by the product of the average group index and the normalized bandwidth, FOM=〈ng〉BW, which is comparable to the values available in literature. Tracing the whole edges of the Brillouin zone, strongly excited SL modes are observed only along Γ-X but not along Γ-X' or Γ-M. That condition allows for the design of low-symmetric PC waveguides with finite thicknesses at the expense of lowering group index value. The SL effect is still obtained for the proposed lowsymmetric PCs having finite thicknesses, which is numerically proved via finite-difference time-domain methods. It is important to note that non-dispersive SL Bloch modes exist through the non-zero k-vector components of Brillouin zone. Hence, such a defect-free (without either point-or line-defect) SL PC design may have a great potential for the use of compact photonic devices such as in optical switching and biochemical sensing applications.

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Section: Introduction and Dispersion Relations Of Proposed Elliptic Photonic Crystalsmentioning

confidence: 99%

Slow-light effect in symmetry-reduced non-defect photonic crystals

Giden

2022

Turkish Journal of Engineering

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“…PhC demonstrates unique optical properties, where the most interesting one is having adjustable photonic band gap [1,2]. On the other hand, slow light phenomenon that can be attained in PhC waveguides is known as a suitable approach to increase light-matter interactions [3][4][5]. By this approach, realization of ultra small nonlinear PhC devices is accessible [6][7][8] A small scale all-optical switch in which the switching path of optical packets is controlled by another optical wave is a key component in recent optical systems [9].…”

Section: Introductionmentioning

confidence: 99%

All-optical switching using a new photonic crystal directional coupler

Vakili

Bahadori-Haghighi

Ghayour

2015

AEM

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In this paper all-optical switching in a new photonic crystal directional coupler is performed. The structure of the switch consists of a directional coupler and a separate path for a control signal called "control waveguide". In contrast to the former reported structures in which the directional couplers are made by removing a row of rods entirely, the directional coupler in our optical switch is constructed by two reduced-radius line-defect waveguides separated by the control waveguide. Furthermore, in our case the background material has the nonlinear Kerr property. Therefore, in the structure of this work, no frequency overlap occurs between the control waveguide mode and the directional coupler modes. It is shown that such a condition provides a very good isolation between the control and the probe signals at the output ports. In the control waveguide, nonlinear Kerr effect causes the required refractive index change by the presence of a high power control (pump) signal. Even and odd modes of the coupler are investigated by applying the distribution of the refractive index change in the nonlinear region of a super-cell so that a switching length of about 94 µm is obtained at the wavelength of 1.55 µ m. Finally, alloptical switching of the 1.55 µm probe signal using a control signal at the wavelength of 1.3 µm, is simulated through the finite-difference time-domain method, where both signals are desirable in optical communication systems. A very high extinction ratio of 67 dB is achieved and the temporal characteristics of the switch are demonstrated.

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Investigation of dependence the hole radius formed in InGaP on the group velocity, quality factor and defect band structures

Ali

Abed

2018

Opt Quant Electron

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Wideband slab photonic crystal waveguides for slow light using differential optofluidic infiltration

Cited by 9 publications

References 52 publications

Slow-light effect in symmetry-reduced non-defect photonic crystals

Slow-light effect in symmetry-reduced non-defect photonic crystals

All-optical switching using a new photonic crystal directional coupler

Investigation of dependence the hole radius formed in InGaP on the group velocity, quality factor and defect band structures

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