Endre søk
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Light manipulation in micro and nano photonic materials and structures
KTH, Skolan för bioteknologi (BIO), Teoretisk kemi och biologi. (Ying Fu)
2012 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Stockholm: KTH Royal Institute of Technology, 2012. , s. 72
Serie
Trita-BIO-Report, ISSN 1654-2312 ; 2012:13
Emneord [en]
Photonic crystal, quantum dot, light-matter interaction
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-94081ISBN: 978-91-7501-353-4 (tryckt)OAI: oai:DiVA.org:kth-94081DiVA, id: diva2:525286
Disputas
2012-06-01, FD51, AlbaNova Universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (engelsk)
Opponent
Veileder
Merknad
QC 20120507Tilgjengelig fra: 2012-05-07 Laget: 2012-05-07 Sist oppdatert: 2012-05-07bibliografisk kontrollert
Delarbeid
1. Increased photocurrent in quantum dot infrared photodetector by subwavelength hole array in metal thin film
Åpne denne publikasjonen i ny fane eller vindu >>Increased photocurrent in quantum dot infrared photodetector by subwavelength hole array in metal thin film
Vise andre…
2010 (engelsk)Inngår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 96, nr 23, s. 231110-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Photocurrent enhancement in quantum dot (QD) infrared photodetector (QDIP) with an optical grating of subwavelength hole array in a thin metal film has been studied by calculating the transmission and diffraction of the infrared optical field through the grating and the light-matter interaction between the transmitted optical field and electrons confined in the QD. It is shown that due to the small aspect ratio of realistic QDs in QDIPs, the light diffraction due to the surface plasmon effect at the metal-semiconductor surface and the photonic subwavelength hole array structure is dominant in increasing the photocurrent.

HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-27515 (URN)10.1063/1.3449117 (DOI)000278695900010 ()2-s2.0-77953508938 (Scopus ID)
Merknad
QC 20110111Tilgjengelig fra: 2011-01-11 Laget: 2010-12-13 Sist oppdatert: 2017-12-11bibliografisk kontrollert
2. Multiple beam splitting to free space from a V groove in a photonic crystal waveguide
Åpne denne publikasjonen i ny fane eller vindu >>Multiple beam splitting to free space from a V groove in a photonic crystal waveguide
Vise andre…
2011 (engelsk)Inngår i: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 102, nr 4, s. 857-861Artikkel i tidsskrift (Fagfellevurdert) 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.

Emneord
DIRECTIONAL EMISSION; ENHANCEMENT; EMITTER
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-32034 (URN)10.1007/s00340-010-4285-2 (DOI)000288447300022 ()2-s2.0-79955920066 (Scopus ID)
Merknad
QC 20110404Tilgjengelig fra: 2011-04-04 Laget: 2011-04-04 Sist oppdatert: 2017-12-11bibliografisk kontrollert
3. Exciton Polariton Contribution to the Stokes Shift in Colloidal Quantum Dots
Åpne denne publikasjonen i ny fane eller vindu >>Exciton Polariton Contribution to the Stokes Shift in Colloidal Quantum Dots
Vise andre…
2011 (engelsk)Inngår i: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 115, nr 13, s. 5286-5293Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We study the exciton polariton contribution to the Stokes shift in colloidal quantum dots (QDs). By detailed quantum mechanical description of light-matter interaction and temporal analysis of incident electromagnetic field across the QD using the finite-difference time-domain method, we have shown that the optical excitation of an exciton in the QD and its coupling with the excitation radiation (i.e., exciton polariton) induce strong variations in the dielectric constant of the QD which contribute significantly to the Stokes shift and cause modifications 50 in the absorption spectrum that agrees well with experiments.

Emneord
CDS NANOCRYSTALS, DEPOSITION, ENERGY, FILMS, DARK
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-32622 (URN)10.1021/jp109608t (DOI)000288885900014 ()2-s2.0-79953677832 (Scopus ID)
Merknad

QC 20110419

Tilgjengelig fra: 2011-04-19 Laget: 2011-04-18 Sist oppdatert: 2017-12-11bibliografisk kontrollert
4. Time-resolved photocurrents in quantum well/dot infrared photodetectors with different optical coupling structures
Åpne denne publikasjonen i ny fane eller vindu >>Time-resolved photocurrents in quantum well/dot infrared photodetectors with different optical coupling structures
Vise andre…
2012 (engelsk)Inngår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 100, nr 4, s. 043502-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Temporal developments of photocurrents excited by an infrared radiation pulse in quantum well/dot infrared photodetectors with different optical coupling structures have been theoretically studied. It is shown that the light diffraction in a conventional reflective grating structure is a near-field effect containing severe crosstalk from neighboring pixels. A concave reflector not only eliminates the crosstalk but also strongly diffracts and focuses the incident electric field into deep active layers, which significantly increases the photocurrents in the photodetectors.

HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-91623 (URN)10.1063/1.3678637 (DOI)000300064500067 ()2-s2.0-84863018238 (Scopus ID)
Merknad
QC 20120323Tilgjengelig fra: 2012-03-23 Laget: 2012-03-19 Sist oppdatert: 2017-12-07bibliografisk kontrollert
5. Comb-shaped photonic crystal structure for efficient broadband light diffraction and funnelling in solar cells
Åpne denne publikasjonen i ny fane eller vindu >>Comb-shaped photonic crystal structure for efficient broadband light diffraction and funnelling in solar cells
2012 (engelsk)Inngår i: Solar Energy Materials and Solar Cells, ISSN 0927-0248, E-ISSN 1879-3398, Vol. 99, s. 316-320Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

We present a comb-shaped photonic-crystal (PhC) rods-lattice structure of broadband light diffraction and funnelling for solar cell applications. It is shown that the photonic band of this PhC structure is very dispersive over a broad bandwidth so that light will be efficiently diffracted in the wavelength region of solar radiation. The PhC structure also creates resonance modes leading to further diffraction and funnelling of light so that the light propagates in many pathways in the whole PhC lattice region, which will greatly facilitate light-matter interaction when light-absorbing elements are embedded in the PhC structure. The proposed structure is also valid for photodetection applications.

Emneord
Light diffraction and funnelling, Photovoltaic, Photonic crystal, Solar cell
HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-92990 (URN)10.1016/j.solmat.2011.12.020 (DOI)000301167200044 ()2-s2.0-84862801322 (Scopus ID)
Merknad
QC 20120411Tilgjengelig fra: 2012-04-11 Laget: 2012-04-10 Sist oppdatert: 2017-12-07bibliografisk kontrollert
6. Improving efficiency of quantum dot infrared photodetector by using photonic crystal framework in the active layer
Åpne denne publikasjonen i ny fane eller vindu >>Improving efficiency of quantum dot infrared photodetector by using photonic crystal framework in the active layer
2011 (engelsk)Konferansepaper, Publicerat paper (Fagfellevurdert)
Abstract [en]

Photonic crystal structure as a framework in both substrate and active layer in quantum dot infrared photodetector is used to improve the interaction between photons and QDs.

HSV kategori
Identifikatorer
urn:nbn:se:kth:diva-94106 (URN)10.1109/CLEOE.2011.5942866 (DOI)2-s2.0-80052289144 (Scopus ID)978-145770533-5 (ISBN)
Konferanse
2011 Conference on Lasers and Electro-Optics Europe and 12th European Quantum Electronics Conference, CLEO EUROPE/EQEC 2011; Munich; Germany; 22-26 May 2011
Merknad

QC 20140916

Tilgjengelig fra: 2012-05-07 Laget: 2012-05-07 Sist oppdatert: 2014-09-16bibliografisk kontrollert

Open Access i DiVA

Doctoral thesis in Photonics(6259 kB)1511 nedlastinger
Filinformasjon
Fil FULLTEXT01.pdfFilstørrelse 6259 kBChecksum SHA-512
9b536cc89b4f91ea89d04f7971d653593c14f201ce3d165cc1a77a3c3f9ea8db641f2717a05bdb7844b32b48fd572214e1a338b9d2842a478c599f87a3926e13
Type fulltextMimetype application/pdf

Søk i DiVA

Av forfatter/redaktør
Chen, Zhihui
Av organisasjonen

Søk utenfor DiVA

GoogleGoogle Scholar
Totalt: 1511 nedlastinger
Antall nedlastinger er summen av alle nedlastinger av alle fulltekster. Det kan for eksempel være tidligere versjoner som er ikke lenger tilgjengelige

isbn
urn-nbn

Altmetric

isbn
urn-nbn
Totalt: 752 treff
RefereraExporteraLink to record
Permanent link

Direct link
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annet format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annet språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf