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Multiple beam splitting to free space from a V groove in a photonic crystal waveguide
KTH, School of Biotechnology (BIO), Theoretical Chemistry.
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2011 (English)In: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 102, no 4, 857-861 p.Article in journal (Refereed) Published
Abstract [en]

We present multiple-beam splitting to free space from a V groove in a two-dimensional photonic crystal waveguide (PCW) with a few additional dielectric rods at the exit of the PCW. Numerical study shows that 'one-beam-in to two-beams-out' (one-to-two, also denoted as Y-shaped), one-to-three, and one-to-five beam splittings can be easily realized over a wide bandwidth, and the split beams have remarkable properties such as symmetric energy distributions and high directional transmissions. Off-axis directional emission can also be achieved by simple displacements of the additional rods at the exit of the PCW.

Place, publisher, year, edition, pages
2011. Vol. 102, no 4, 857-861 p.
Keyword [en]
DIRECTIONAL EMISSION; ENHANCEMENT; EMITTER
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-32034DOI: 10.1007/s00340-010-4285-2ISI: 000288447300022Scopus ID: 2-s2.0-79955920066OAI: oai:DiVA.org:kth-32034DiVA: diva2:408322
Note
QC 20110404Available from: 2011-04-04 Created: 2011-04-04 Last updated: 2017-12-11Bibliographically approved
In thesis
1. Light manipulation in micro and nano photonic materials and structures
Open this publication in new window or tab >>Light manipulation in micro and nano photonic materials and structures
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Light manipulation is an important method to enhance the light-matter interactions in micro and nano photonic materials and structures by generating usefulelectric field components and increasing time and pathways of light propagationthrough the micro and nano materials and structures. For example, quantum wellinfrared photodetector (QWIP) cannot absorb normal incident radiation so thatthe generation of an electric field component which is parallel to the original incident direction is a necessity for the function of QWIP. Furthermore, the increaseof time and pathways of light propagation in the light-absorbing quantum wellregion will increase the chance of absorbing the photons.The thesis presents the theoretical studies of light manipulation and light-matter interaction in micro and nano photonic materials and structures, aiming atimproving the performance of optical communication devices, photonic integrateddevices and photovoltaic devices.To design efficient micro and nano photonic devices, it is essential to knowthe time evolution of the electromagnetic (EM) field. Two-dimensional and three-dimensional finite-difference time-domain (FDTD) methods have been adopted inthe thesis to numerically solve the Maxwell equations in micro and nano photonicmaterials and structures.Light manipulation in micro and nano material and structures studied in thisthesis includes: (1) light transport in the photonic crystal (PhC) waveguide, (2)light diffraction by the micro-scale dielectric PhC and metallic PhC structures(gratings); and (3) exciton-polaritons of semiconductor quantum dots, (4) surfaceplasmon polaritons at semiconductor-metallic material interface for subwavelengthlight control. All these aspects are found to be useful in optical devices of multiplebeam splitter, quantum well/dot infrared photodetectors, and solar cells.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. 72 p.
Series
Trita-BIO-Report, ISSN 1654-2312 ; 2012:13
Keyword
Photonic crystal, quantum dot, light-matter interaction
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:kth:diva-94081 (URN)978-91-7501-353-4 (ISBN)
Public defence
2012-06-01, FD51, AlbaNova Universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20120507Available from: 2012-05-07 Created: 2012-05-07 Last updated: 2012-05-07Bibliographically approved

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Fu, Ying

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