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Polarization beam splitter based on a two-dimensional photonic crystal of pillar type
KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.
KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.ORCID-id: 0000-0001-5967-2651
KTH, Skolan för informations- och kommunikationsteknik (ICT), Mikroelektronik och Informationsteknik, IMIT.ORCID-id: 0000-0002-3401-1125
2006 (Engelska)Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Applied physics letters, Vol. 89, nr 17, s. 171115-Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Negatively and positively refractive behaviors are achieved in a two-dimensional photonic crystal of pillar type for TE and TM polarizations, respectively, at the same frequency. The photonic crystal is formed by a triangular lattice of silicon pillars of finite height on a silicon substrate. A polarization beam splitter based on such a photonic-crystal slab is demonstrated. Measurements at near infrared wavelengths indicate that two beams of different polarizations can be split with an extinction ratio of over 10 dB in a wide wavelength range.

Ort, förlag, år, upplaga, sidor
2006. Vol. 89, nr 17, s. 171115-
Nationell ämneskategori
Telekommunikation
Identifikatorer
URN: urn:nbn:se:kth:diva-6439DOI: 10.1063/1.2360201ISI: 000241585800015Scopus ID: 2-s2.0-33750440504OAI: oai:DiVA.org:kth-6439DiVA, id: diva2:11153
Anmärkning
QC 20100908Tillgänglig från: 2006-11-29 Skapad: 2006-11-29 Senast uppdaterad: 2020-05-11Bibliografiskt granskad
Ingår i avhandling
1. Design, Fabrication, and Characterization of Nano-Photonic Components Based on Silicon and Plasmonic Material
Öppna denna publikation i ny flik eller fönster >>Design, Fabrication, and Characterization of Nano-Photonic Components Based on Silicon and Plasmonic Material
2006 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Size reduction is a key issue in the development of contemporary integrated photonics. This thesis is mainly devoted to study some integrated photonic components in sub-wavelength or nanometric scales, both theoretically and experimentally. The possible approaches to reduce the sizes or to increase the functionalities of photonic components are discussed, including waveguides and devices based on silicon nanowires, photonic crystals, surface plasmons, and some near-field plasmonic components.

First, some numerical methods, including the finite-difference time-domain method and the full-vectorial finite-difference mode solver, are introduced. The finite-difference time-domain method can be used to investigate the interaction of light fields with virtually arbitrary structures. The full-vectorial finite-difference mode solver is mainly used for calculating the eigenmodes of a waveguide structure.

The fabrication and characterization technologies for nano-photonic components are reviewed. The fabrications are mainly based on semiconductor cleanroom facilities, which include thin film deposition, electron beam lithography, and etching. The characterization setups with the end-fire coupling and the vertical grating coupling are also described.

Silicon nanowire waveguides and related devices are studied. Arrayed waveguide gratings with 11nm and 1.6nm channel spacing are fabricated and characterized. The dimension of these arrayed waveguide gratings is around 100 μm, which is 1--2 order of magnitude smaller than conventional silica based arrayed waveguide gratings. A compact polarization beam splitter employing positive/negative refraction based on a photonic crystal of silicon pillars is designed and demonstrated. Extinction ratio of ~15dB is achieved experimentally in a wide wavelength range.

Surface plasmon waveguides and devices are analyzed theoretically. With surface plasmons the light field can be confined in a sub-wavelength dimension. Some related photonic devices, e.g., directional couplers and ring resonators, are studied. We also show that some ideas and principles of microwave devices, e.g., a branch-line coupler, can be borrowed for building corresponding surface plasmon based devices. Near-field plasmonic components, including near-field scanning optical microscope probes and left handed material slab lenses, are also analyzed. Some novel designs are introduced to enhance the corresponding systems.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH, 2006. s. xii, 76
Serie
Trita-ICT/MAP ; 2006:4
Nyckelord
nano-photonics, finite-difference time-domain method, finite-difference mode solver, amorphous silicon, silicon nanowire, arrayed waveguide grating, photonic crystal
Nationell ämneskategori
Telekommunikation
Identifikatorer
urn:nbn:se:kth:diva-4193 (URN)91-7178-492-6 (ISBN)
Disputation
2006-12-08, Sal E, KTH-Forum, Isafjordsg. 39, Kista, 10:00
Opponent
Handledare
Anmärkning
QC 20100908Tillgänglig från: 2006-11-29 Skapad: 2006-11-29 Senast uppdaterad: 2010-09-08Bibliografiskt granskad

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