Wideband slow light in photonic crystal slab waveguide based on geometry adjustment and optofluidic infiltration

Janfaza, Morteza; Mansouri-Birjandi, Mohammad Ali

doi:10.1364/ao.52.008184

Cited by 19 publications

(5 citation statements)

References 31 publications

(39 reference statements)

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“…The guided modes in PCWs in terms of the field distribution are classified into the gap-guided modes (GGMs) and the index-guided modes (IGMs). The GGMs with respect to the periodic structure are restricted by distributed Bragg reflection, while IGMs are confined by the total internal reflection because of the index contrast between the waveguide and the surrounding medium [32]. The holes near to the core of the slab waveguide are the coupling points of IGM and GGM.…”

Section: Delay-bandwidth Productmentioning

confidence: 99%

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

et al. 2015

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A new type of wideband slow light with a large delay bandwidth product in a slab photonic crystal waveguide with a triangular lattice of circular air holes in a silicon-on-insulator substrate based on optofluidic infiltration is demonstrated. It is shown that dispersion engineering through infiltrating optical fluids-with different refractive indices n(1f) and n(2f)--in the first two rows of the air holes innermost to the waveguide results in an improved normalized delay bandwidth product ranging from 0.187 to 0.377 with large bandwidth (12 nm<Δλ<32 nm) and group index (14.20< n(g)< 24.62) around 1550 nm. The nearly zero group velocity dispersion on the order of 10-(20) s(2)/m is achieved in all of the structures. These results are obtained by numerical simulation based on a three-dimensional-plane-wave expansion method.

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Section: Delay-bandwidth Productmentioning

confidence: 99%

“…Optofluidics is a new branch of photonics that combines microfluidics and photonics [29][30][31][32]. Due to the intrinsic holey nature of slab PCWs, fluids with different optical properties can be injected into some PCW holes.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2015

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“…In recent years, for the tuning technology of photonic crystal structures for color change, scientists have promoted various research through numerical simulation [7,[25][26][27][28] and experiments , realized many methods such as solvent penetration [29,30], phase transformation [31,32], chemical reaction [33], mechanochromism [34][35][36][37][38][39][40][41][42], magnetic tuning [43][44][45][46], optical response tuning [47][48][49], electrochromism [50][51][52][53][54] and thermal tuning [55]. Among them, the principle of mechanochromism is to cause a deformation of the photonic crystals by mechanical force, thus changing the lattice constant, which will lead to structural color changes.…”

Section: Introductionmentioning

confidence: 99%

Stretchable photonic crystals with periodic cylinder shaped air holes for improving mechanochromic performance

Zhao

Tang

et al. 2019

Smart Mater. Struct.

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Photonic crystals are able to change the macroscopic color by regulating the center wavelength of band gap with altering the lattice constant of nano-structures. Herein, stretchable photonic crystals, with periodic cylinder shaped air holes non-close-packed in triangular lattice, are designed and fabricated for mechanochromism in entire visible light range. Numerical simulation has verified the excellent mechanochromic ability for the proposed nano-structure. Then the stretchable photonic crystals with this structure are successfully prepared by nanoimprinting technology on PDMS. Subsequently, the mechanochromic properties of the prepared materials are studied, and color change over the entire visible light range from red to blue is observed under a small strain of 29%. In addition, cyclic stretching tests up to 2000 times show that the materials are capable of maintaining shape recovery ability as well as mechanochromic ability. Finally, a stretchable visual strain sensor is prepared using the stretchable photonic crystal. This sensor can distinguish three strain ranges below 30% of strain rate by its color change that offers a visual observation of strain ranges. The stretchable visual strain sensors is more sensitive to small strain than resistance sensors, which may have great potential for applications of visual monitoring stretching strain.

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“…It has many potential applications in the areas of optical delay lines [1][2][3], ultrafast all-optical signal processing [4][5][6], quantum computing [7,8], and nonlinear optical devices [9][10][11]. Photonic crystal, particularly constructed in a silicon-on-insulator slab, is among the most optimal structures for achieving slow light in a waveguide formation [12].…”

Section: Introductionmentioning

confidence: 99%

Slow light with large group index–bandwidth product in ellipse-hole photonic crystal waveguides

et al. 2015

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In this study, we propose a new type of slow light photonic crystal waveguide structure to achieve wideband slow light with low dispersion. The waveguide is based on a triangular lattice ellipse-hole photonic crystal imposed simply by a selective altering of the locations of the holes adjacent to the line defect. Under a constant group index criterion of ±10% variation, when group indices are nearly constants of 54, 69, and 80, their corresponding bandwidths of the flat band reach 12.7, 10.0, and 8.6 nm around 1550 nm, respectively. A nearly constant large group index-bandwidth product of 0.44 is achieved for all cases. Low dispersion slow light propagation is confirmed by studying the relative temporal pulse-width spreading with the two-dimensional finite-difference time-domain method.

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Wideband slow light in photonic crystal slab waveguide based on geometry adjustment and optofluidic infiltration

Cited by 19 publications

References 31 publications

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

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

Stretchable photonic crystals with periodic cylinder shaped air holes for improving mechanochromic performance

Slow light with large group index–bandwidth product in ellipse-hole photonic crystal waveguides

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