Low-loss propagation in photonic crystal waveguides

О’Faolain, L.; Yuan, Xiaodong; McIntyre, David; Thoms, S.; Chong, Harold M. H.; Rue, R.M. De La; Krauss, Thomas F.

doi:10.1049/el:20063077

Cited by 103 publications

(52 citation statements)

References 2 publications

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“…The main challenge is to etch the thicker device layer of 500 nm with comparable roughness, to that already achieved in the 220 nm thick layers used for 1.5 µm operation. In the near-IR, propagation losses below 5 dB/cm [18] with a record of 2 dB/cm [19] have been achieved, and roughness values below 1 nm have been demonstrated [20]. Such low roughness is already close to the technological limit and further improvements require additional improvements in more loss-tolerant waveguide designs [10].…”

Section: Characterisationmentioning

confidence: 98%

Mid-infrared photonic crystal waveguides in silicon

Reimer¹,

Nedeljkovic²,

Stothard³

et al. 2012

Opt. Express

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Abstract:We demonstrate the design, fabrication and characterization of mid-infrared photonic crystal waveguides on a silicon-on-insulator platform, showing guided modes in the wavelength regime between 2.9 and 3.9 µm. The characterization is performed with a proprietary intra-cavity Optical Parametric Oscillator in a free space optical setup and with a fibre coupled setup using a commercial Quantum Cascade Laser. We discuss the use of an integrated Mach-Zehnder interferometer for dispersion measurements and report a measured group velocity of up to a value of n g = 12, and determine the propagation loss to be 20 dB/cm.

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Section: Characterisationmentioning

confidence: 98%

Mid-infrared photonic crystal waveguides in silicon

Reimer¹,

Nedeljkovic²,

Stothard³

et al. 2012

Opt. Express

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“…Therefore, the Si PC slab (n = 3.47) in our study is suspended in air. Air-bridge photonic crystal structures can be practically fabricated by using selective wet etching techniques [27,28] and can be easily integrated with micro uidics [29]. The height of the PC slab is selected as h = 0.6a and seven rows of holes are introduced on each side of the line-defect.…”

Section: Design and Modelingmentioning

confidence: 99%

Enhancement of Refractive Index Sensitivity in Photonic Crystal Waveguide-Based Sensors by Selective Infiltration

Bagci

Akaoglu

2013

Acta Phys. Pol. A

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We present a liquid refractive index sensor based on a photonic crystal waveguide slab structure. Sensing mechanism employed in this study is based on the shift in cut-o wavelength as the lattice holes are selectively in ltrated. Three-dimensional plane-wave expansion and nite-di erence time-domain methods are used to determine the band structure and transmission spectra, respectively. First, the sensitivity of the device is analyzed for the structure where only the rst rows of holes adjacent to the line-defect are in ltrated. In addition, this analysis is repeated for a range of hole diameters. Second, the e ects of in ltrated holes which are placed in the line-defect are investigated. As these in ltrated central holes are introduced, the proposed device exhibits 5.3 times improved sensitivity.

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“…The lattice constant, a is adjusted to 432.5 nm. Membrane slab structures can be fabricated by selectively etching the substrate beneath the PC regions forming an air-bridge [11]. This structure provides a symmetric configuration preventing the decoupling of orthogonal polarisation states and a stronger index confinement along the vertical dimension.…”

Section: Design and Numerical Calculationsmentioning

confidence: 99%

A 1x4 power-splitter based on photonic crystal Y-splitter and directional couplers

Bagci¹,

Akaoglu

2013

Opt. Pura Apl.

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ABSTRACT:A 1×4 photonic crystal power splitter operating in the optical communication window is demonstrated by plane-wave expansion and finite-difference time-domain simulations. The device consists of one Y-junction and two directional couplers. Double 60º bends are formed at the exit of directional couplers to prevent crosstalk. The Y-junction, double bends and coupling holes at the directional couplers are optimized to increase the transmission efficiency at the output ports. The simulation results exhibit almost equal power splitting with low loss characteristic. The investigated design shows potential for optical switching and routing applications in optical communications.

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Low-loss propagation in photonic crystal waveguides

Cited by 103 publications

References 2 publications

Mid-infrared photonic crystal waveguides in silicon

Mid-infrared photonic crystal waveguides in silicon

Enhancement of Refractive Index Sensitivity in Photonic Crystal Waveguide-Based Sensors by Selective Infiltration

A 1x4 power-splitter based on photonic crystal Y-splitter and directional couplers

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