| 51. |
- Shi, Yaocheng, et al.
(författare)
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Novel ultracompact triplexer based on photonic crystal waveguides
- 2006
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Ingår i: IEEE Photonics Technology Letters. - : Institute of Electrical and Electronics Engineers (IEEE). - 1041-1135 .- 1941-0174. ; 18:21-24, s. 2293-2295
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Tidskriftsartikel (refereegranskat)abstract
- Two stages of directional couplers based on photonic crystal waveguides Are cascaded to form an ultracompact triplexer. The directional couplers are decoupled at the wavelength of 1310 rum. The length of the coupling region in the first directional coupler is chosen to separate the other two wavelengths (i.e., 1490 and 1550 nm), and the coupling region is tapered to improve the extinction ratios. The second directional coupler separates the wavelengths of 1490 and 1310 run. For the channel of 1550 nm, an additional directional coupler is used to reduce the crosstalk from the channels of 1490 and 1310 nm. The total size of the present triplexer is only 50 mu m x 20 mu m, and the good performance is verified with finite-difference time-domain simulation.
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| 52. |
- Shi, Yaocheng, et al.
(författare)
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Proposal for an ultracompact polarization-beam splitter based on a photonic-crystal-assisted multimode interference coupler
- 2007
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Ingår i: IEEE Photonics Technology Letters. - : Institute of Electrical and Electronics Engineers (IEEE). - 1041-1135 .- 1941-0174. ; 19:9-12, s. 825-827
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Tidskriftsartikel (refereegranskat)abstract
- An ultracompact polarization-beam splitter (PBS) combining a multimode interference (MMI) coupler and some photonic crystal (PC) structures is presented. The MMI coupler is designed to collect polarized powers reflected by or transmitted through an internal PC sturcture. The simulation result shows that the designed PBS is very short (about 50 mu m), and has a low insertion loss, a high extinction ratio, and a broad bandwidth.
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| 53. |
- Sun, Xu, 1987-, et al.
(författare)
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Double-Slot Hybrid Plasmonic Ring Resonator Used for Optical Sensors and Modulators
- 2015
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Ingår i: Photonics. - Basel, Switzerland : MDPI AG. - 2304-6732. ; 2:4, s. 1116-1130
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Tidskriftsartikel (refereegranskat)abstract
- An ultra-high sensitivity double-slot hybrid plasmonic (DSHP) ring resonator, used for optical sensors and modulators, is developed. Due to high index contrast, as well as plasmonic enhancement, a considerable part of the optical energy is concentrated in the narrow slots between Si and plasmonic materials (silver is used in this paper), which leads to high sensitivity to the infiltrating materials. By partial opening of the outer plasmonic circular sheet of the DSHP ring, a conventional side-coupled silicon on insulator (SOI) bus waveguide can be used. Experimental results demonstrate ultra-high sensitivity (687.5 nm/RIU) of the developed DSHP ring resonator, which is about five-times higher than for the conventional Si ring with the same geometry. Further discussions show that a very low detection limit (5.37 × 10−6 RIU) can be achieved after loaded Q factor modifications. In addition, the plasmonic metal structures offer also the way to process optical and electronic signals along the same hybrid plasmonic circuits with small capacitance (~0.275 fF) and large electric field, which leads to possible applications in compact high-efficiency electro-optic modulators, where no extra electrodes for electronic signals are required
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| 54. |
- Sun, Xu, et al.
(författare)
-
High-sensitivity liquid refractive-index sensor based on a Mach-Zehnder interferometer with a double-slot hybrid plasmonic waveguide
- 2015
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Ingår i: Optics Express. - : Optical Society of America. - 1094-4087. ; 23:20, s. 25688-25699
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Tidskriftsartikel (refereegranskat)abstract
- A Mach-Zehnder Interferometer (MZI) liquid sensor, employing ultra-compact double-slot hybrid plasmonic (DSHP) waveguide as active sensing arm, is developed. Numerical results show that extremely large optical confinement factor of the tested analytes (as high as 88%) can be obtained by DSHP waveguide with optimized geometrical parameters, which is larger than both, conventional SOI waveguides and plasmonic slot waveguides with same widths. As for MZI sensor with 40 mu m long DSHP active sensing area, the sensitivity can reach as high value as 1061nm/RIU (refractive index unit). The total loss, excluding the coupling loss of the grating coupler, is around 4.5dB.
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| 55. |
- Tang, Yongbo, et al.
(författare)
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Proposal for a Grating Waveguide Serving as Both a Polarization Splitter and an Efficient Coupler for Silicon-on-Insulator Nanophotonic Circuits
- 2009
-
Ingår i: IEEE Photonics Technology Letters. - : Institute of Electrical and Electronics Engineers (IEEE). - 1041-1135 .- 1941-0174. ; 21:1-4, s. 242-244
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Tidskriftsartikel (refereegranskat)abstract
- A grating waveguide is introduced and designed to serve as both a polarization splitter and an efficient vertical coupler between a fiber and a silicon-on-insulator (SOI) nanophotonic waveguide. Through this grating waveguide, the light from the fiber can be efficiently coupled into an SOI chip where the two orthogonally polarized waves are separated to travel towards the opposite directions along the waveguide. According to our simulations, the optimized structure can give a high coupling efficiency of about 50% for both polarizations, as well as a large bandwidth of over 70 nm and a very low polarization crosstalk below -22 dB at the output ports.
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| 56. |
- Thylén, Lars, et al.
(författare)
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Complementing or replacing silicon and III–Vs: The role of plasmonics and novel materials in future integrated photonics for telecom and interconnects
- 2011
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Ingår i: 2011 13th International Conference on Transparent Optical Networks, ICTON 2011. - : IEEE Communications Society. - 9781457708817 - 9781457708800
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Konferensbidrag (refereegranskat)abstract
- Integrated photonics has largely been based on silicon/silica and III-Vs in recent times. Both have their advantages and disadvantages, but neither seem capable of supporting a further significant reduction of device footprint to sustain the exponential decrease of this important parameter that we have witnessed since decades. The talk will analyze different aspects of plasmonics from this and a functionality point of view and further discuss some possible alternative materials.
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| 57. |
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| 58. |
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| 59. |
- Thylén, Lars, et al.
(författare)
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Metamaterials- and Nanotechnology-based Low Power and Small Footprint Integrated Photonics
- 2011
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Ingår i: 2011 IEEE Photonics Conference (PHO). - : IEEE Communications Society. - 9781424489404 ; , s. 537-538
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Konferensbidrag (refereegranskat)abstract
- Integrated nanophotonics has shown a remarkable development in recent years and can find applications in virtually all fields of photonics, though its predominant focus has so far been in telecom and lately computer interconnects. This progress has primarily been based on nanoand ΠI-V technology development, the introduction of silicon technology, with larger refractive index contrast than previously available, as well as subwavelength plasmonics structures. For the latter, a main problem, especially for ICT applications, has been the large optical loss associated with deep subwavelength confinement, as in this paper.
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| 60. |
- Thylén, Lars, et al.
(författare)
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Moore’s law for photonic integrated circuits
- 2006
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Ingår i: JZUS-A - Journal of Zhejiang University. Science. - 1009-3095. ; 7:12, s. 1961-1967
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Tidskriftsartikel (refereegranskat)abstract
- We formulate a “Moore’s law” for photonic integrated circuits (PICs) and their spatial integration density using twomethods. One is decomposing the integrated photonics devices of diverse types into equivalent basic elements, which makes acomparison with the generic elements of electronic integrated circuits more meaningful. The other is making a complex componentequivalent to a series of basic elements of the same functionality, which is used to calculate the integration density for functionalcomponents realized with different structures. The results serve as a benchmark of the evolution of PICs and we can concludethat the density of integration measured in this way roughly increases by a factor of 2 per year. The prospects for a continuedincrease of spatial integration density are discussed.
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