| 1. |
- Dai, Daoxin, et al.
(författare)
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Compact silicon-based wavelength-selective photonic integrated devices and the applications
- 2009
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Ingår i: SILICON PHOTONICS IV. - : SPIE-INT SOC OPTICAL ENGINEERING. - 9780819474667
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Konferensbidrag (refereegranskat)abstract
- In wavelength-division multiplexing systems, it is important to develop various wavelength-selective components to have flexible and reconfigurable nodes. When using conventional optical waveguides with low index contrast, the sizes of these wavelength-selective components are usually several cm(2), which is too large to integrate more components in a single wafer or chip. In order to improve the integration density and reduce the cost, it is desirable to minimize the component sizes. In our case, two kinds of strongly-confined optical waveguides on silicon wafer are considered for compact wavelength-selective devices. One is the popular silicon-on-insulator (SOI) nanowire and the other is SU-8 strip optical waveguide with an air cladding and a SiO2 insulator layer on a Si substrate. In this paper, we give a review of our recent work on wavelength-selective photonic integrated devices based on these two kinds of silicon-based optical waveguides with strong-confinements. Arrayed-waveguide grating (AWG) and microring resonator (MRR), which are two typical wavelength-selective components are included. First we give a review for several new layouts for SOI-nanowire AWG to have a further size-reduction and our novel designs for diminishing the polarization dependency of AWGs. Secondly we present the design and fabrication of multimode interference (MMI) couplers for MRRs. A novel design method for tapered MMI couplers is presented and the diminishment of polarization in a MMI coupler is proposed by optimizing the tapered MMI section. We also present our experimental results on optical sensor combining MRRs and micro-fluid channel. The measured sensitivity is about 180nm/RIU.
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| 2. |
- Dai, Daoxin, et al.
(författare)
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Integrated Silicon Photonic Nanocircuits and Technologies for Optical Interconnect and Optical Sensing
- 2012
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Ingår i: OPTOELECTRONIC INTEGRATED CIRCUITS XIV. - : SPIE-INT SOC OPTICAL ENGINEERING. - 9780819489081
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Konferensbidrag (refereegranskat)abstract
- Silicon-on-insulator (SOI) nanowires give a very promising way to realize ultrasmall photonic integrated devices because of the ability for ultrasharp bending as well as the CMOS compatibility. As a typical integrated-type (de) multiplexer, ultrasmall arrayed-waveguide gratings (AWG) are very attractive for many applications. We have developed several types of ultrasmall SOI-nanowire AWG with novel layouts. SOI nanowires also give a good platform for optical sensing with high sensitivity because of the enhanced evanescent field. We have developed SOI-nanowire-based optical sensors by using MZI (Mech-Zehnder interferometer)-coupled microrings and cascaded rings. We also note that the size of an SOI nanowire is still limited to the order of wavelength in each direction. In contrast, surface plasmon (SP) waveguides could provide a nano-scale waveguiding and confinement of light. However, the conventional nano-scale SP waveguides are usually quite lossy. We have proposed two types of novel hybrid plasmonic waveguides to achieve nano-scale optical confinement and low-loss light propagation. Due to the ultra-high optical confinement, sub-mu m-2 hybrid plasmonic devices (e. g., power splitters) are presented. It is also shown that hybrid plasmonic waveguide enables sub-mu m bending and thus sub-mu m resonator has been also demonstrated. The hybrid plasmonic waveguides offer a way to transfer both photonic and electronic signals along the same circuit, which is attractive for active components, e. g., tunable filters and optical modulators.
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| 3. |
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| 4. |
- Dai, Daoxin, et al.
(författare)
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Ultracompact silicon nanowire circuits for optical communication and optical sensing
- 2011
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Ingår i: 2011 IEEE Winter Topical. - 9781424484287 ; , s. 25-26
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Konferensbidrag (refereegranskat)abstract
- By utilizing Si nanowires, ultracompact photonic integrated circuits are realized. Some Si hybrid plasmonic waveguides are also introduced for subwavelength optical confinement and low loss propagation. We review our recent work on Si nanophotonic integrated circuits and their applications.
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| 5. |
- Guan, Xiaowei, et al.
(författare)
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Ultrasmall Directional Coupler and Disk-resonantor Based on Nano-scale Silicon Hybrid Plasmonic Waveguides
- 2012
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Ingår i: 2012 Asia Communications And Photonics Conference (ACP). - Washington, D.C. : OSA. - 9781467362740 ; , s. AS2H.4-
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Konferensbidrag (refereegranskat)abstract
- Nanophotonic integrated devices based on nano-scale silicon hybrid plasmonic waveguides have been demonstrated experimentally, including directional couplers and disk-resonators. The temperature-dependence of the hybrid plasmonic disk-resonators is also characterized.
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| 6. |
- He, Sailing, et al.
(författare)
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Some progress in integrated photonics
- 2005
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Ingår i: OPTOELECTRONIC DEVICES AND INTEGRATION. - : SPIE. - 0819455997 ; , s. 405-413
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Konferensbidrag (refereegranskat)abstract
- A review is presented on some progress we have made recently in planar integrated photonics including arrayed-waveguide gratings (AWGs) and etched diffraction gratings (EDGs), multimode interference (MMI) couplers/splitters, and spot-size converters. Some novel structures and design methods are summarized and presented.
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| 7. |
- Liu, Liu, et al.
(författare)
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Compact Arrayed Waveguide Grating Demultiplexers Based on Amorphous Silicon Nanowires
- 2006
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Ingår i: Integrated Photonics Research and Applications/Nanophotonics 2006, NWB5,April 24–28, 2006, Uncasville, Connecticut, USA..
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Konferensbidrag (refereegranskat)abstract
- A novel and flexible technology for ultra compact AWGs based on amorphous silicon nanowires is presented. A 4×4 AWG with a total dimension of 50×50µm was fabricated. 11nm channel spacing and -10dB crosstalk was obtained.
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| 8. |
- Liu, Liu, et al.
(författare)
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Highly integrated planar lightwave circuits based on plasmonic and Si nano-waveguides
- 2006
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Ingår i: Passive Components and Fiber-Based Devices III, Pts 1 and 2. - BELLINGHAM, WA : SPIE-INT SOC OPTICAL ENGINEERING. - 0819464465 ; , s. U765-U779
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Konferensbidrag (refereegranskat)abstract
- Planar lightwave circuits (PLC) based on nanophotonic waveguides are becoming more and more attractive because of their ultrasmall sizes and possibility for realizing large scale monolithic integration with a very high integration density. In this paper we discuss two attractive types of nanophotonic waveguides based on dielectrics or metals. For the dielectric type, a silicon-on-insulator (SOI) strip waveguide is considered, and ultra-compact photonic integrated devices such as polarization-insensitive arrayed waveguide grating (de)multiplexers are obtained. Based on the fact that light can be confined tightly in a single interface between a metal and dielectric, a surface plasmon (SP) waveguide can offer a tight confinement for the light field. The cross-sectional size of an SP waveguide could be pushed down to tens of nanometers, i.e. beyond the diffraction limit. An accurate anaylysis for an SP waveguide formed by a dielectric nano-trench in a metal is presented. A novel subwavelength index-guided multimode plasmonic waveguide is introduced and an ultra-compact MMI power splitter is designed.
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| 9. |
- Lou, Fei, et al.
(författare)
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Photonic devices based on silicon hybrid plasmonic waveguides
- 2012
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Ingår i: 2012 Asia Communications And Photonics Conference (ACP). - Washington, D.C. : Optica Publishing Group. ; , s. AS2H.2-
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Konferensbidrag (refereegranskat)abstract
- A 170 nm wide hybrid plasmonic waveguide with a loss of 0,08 dB/mu m is demonstrated experimentally. Directional couplers with different gaps and microdisks with 0.5 mu m radius based on such waveguides are also presented.
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| 10. |
- Lou, Fei, et al.
(författare)
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Sub-wavelength microdisk resonator based on hybrid plasmonic waveguides
- 2012
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Ingår i: Information Optoelectronics, Nanofabrication and Testing, IONT 2012. - 9781557529602
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Konferensbidrag (refereegranskat)abstract
- Based on hybrid plasmonic waveguides, microdisk resonators with radii of 0.5 μm and FSRs of about 200 nm are simulated and experimentally demonstrated. Thermal tuning of the devices in 6 nm range is also presented.
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