Circuit model for efficient analysis and design of photonic crystal devices

Khavasi, Amin; Rezaei, Mohsen; Miri, Mehdi; Mehrany, Khashayar

doi:10.1088/2040-8978/14/12/125502

Cited by 8 publications

(3 citation statements)

References 30 publications

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“…One travels straight ahead (along the dashed black line) and the other travels along the upper U-shaped path (along the solid blue curve). To ensure that the latter path retains high transmission, two dielectric rods, indicated by solid green and dashed red arrows in figure 1, are displaced by 0.2a with respect to their original positions downward and leftward, respectively [22].…”

Section: Rightward Transmissionmentioning

confidence: 99%

A heuristic approach to the realization of the wide-band optical diode effect in photonic crystal waveguides

Khavasi¹,

Rezaei²,

Fard³

et al. 2013

J. Opt.

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In this paper a highly efficient optical diode is demonstrated in photonic crystal waveguides with broken spatial symmetry. The structure is made of isotropic linear materials and does not need high power optical beams or strong magnetic fields. While the proposed structure shows almost complete light transmission (>99%) in one direction, it blocks light transmission in the opposite direction. This unidirectional transmission is retained within a wide range of frequencies (>4% of central frequency). In order to achieve an optical diode effect, the optical mode of the waveguide is manipulated by designing an ultra-compact mode converter and an efficient mode filter. The dimensions of the proposed mode converter are less than two wavelengths long.

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Section: Rightward Transmissionmentioning

confidence: 99%

A heuristic approach to the realization of the wide-band optical diode effect in photonic crystal waveguides

Khavasi¹,

Rezaei²,

Fard³

et al. 2013

J. Opt.

Self Cite

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“…The latter method has been reported to be accurate and less computationally intensive than FDTD and FEM. One of the successful semi-analytical methods to describe PC cavities and their properties, namely their resonance frequency together with their quality factor has been reported by 29 . This approach utilizes the principle of impedance matching in a transmission line to examine the flaws in PCs.…”

Section: Introductionmentioning

confidence: 99%

Design and analysis of 2D one-way splitter waveguide based on topological photonics

Mehdipoura,

Moeini,

Ahmadi

et al. 2024

Sci Rep

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We present a new high-efficiency splitter waveguide design based on photonic topological insulators. The system’s robust edge states allow electromagnetic waves to propagate in the 2D waveguide without backscattering, resulting in almost 100% transmission in the outputs. We also study resonating modes in the structure and show that introducing specific defects can create such modes. We consider four domains with rods of varying magneto-optical properties to provide edge modes in the system. By eliminating rows and columns of rods, we calculate the transmission at the outputs, revealing resonating modes in the middle of the structure with spatial symmetry. Our calculations indicate that the most promising resonating mode occurs when two rods and two columns are eliminated, with a quality factor Q = 1.02 × 106 at frequency f = 8.23 GHz and almost zero transmission at this frequency to the outputs. We further confirm our results using the transmission line resonator model as a semi-analytical model, which agrees well with our findings.

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“…For instance, by placing a photonic structure around a waveguide channel, lightwave which has a frequency inside the PBG can be prevented from leaving the waveguide [8]. Waveguides are essential building blocks of a PhC circuit [9,10]. For example, in optoelectronic integrated circuits, high-speed and high-capacity dense ratio multiplexing network systems need to focus on high-speed transmission, multiplexing, optical bifurcation, optical crossinterconnection, optical waveguide switches and high-speed optical modulation.…”

Section: Introductionmentioning

confidence: 99%

Numerical optimization design for waveguide bends with low-loss and wide-bandwidth in two-dimensional photonic crystal slabs

Zhang¹,

Yuan²,

Ai³

2019

J. Opt.

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In this paper, we demonstrate some optimization designs for waveguide bends in two-dimensional photonic crystal slabs based on the effective index approximation. Four different types of waveguide bends with low-loss and wide-bandwidth are designed, which involve 60°, Z-shaped, Y-shaped and 120° waveguide bends in the two-dimensional triangular lattice photonic crystals. In all numerical experiments, the electromagnetic fields in the photonic crystal slab waveguides are solved by the finite element method in COMSOL software. Several strategies are applied to design slab waveguide bends with low-loss and wide-bandwidth, for example, adding some elliptical air-holes near the corner or adjusting the radii of some air-holes. For four optimized structures, the transmission efficiencies at 1550 nm are all more than 92%. As we show, this is achieved over a −0.915 dB bandwidth of more than 65 nm in all waveguide bends. The numerical results indicate that the design scheme we applied to optimize waveguide bends in photonic crystal slabs is simple and efficient, which can provide some useful guidance for further three-dimensional design.

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Circuit model for efficient analysis and design of photonic crystal devices

Cited by 8 publications

References 30 publications

A heuristic approach to the realization of the wide-band optical diode effect in photonic crystal waveguides

A heuristic approach to the realization of the wide-band optical diode effect in photonic crystal waveguides

Design and analysis of 2D one-way splitter waveguide based on topological photonics

Numerical optimization design for waveguide bends with low-loss and wide-bandwidth in two-dimensional photonic crystal slabs

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