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Light manipulation in micro and nano photonic materials and structures
KTH, Skolan för bioteknologi (BIO), Teoretisk kemi och biologi. (Ying Fu)
2012 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
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.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2012. , s. 72
Serie
Trita-BIO-Report, ISSN 1654-2312 ; 2012:13
Nyckelord [en]
Photonic crystal, quantum dot, light-matter interaction
Nationell ämneskategori
Atom- och molekylfysik och optik
Identifikatorer
URN: urn:nbn:se:kth:diva-94081ISBN: 978-91-7501-353-4 (tryckt)OAI: oai:DiVA.org:kth-94081DiVA, id: diva2:525286
Disputation
2012-06-01, FD51, AlbaNova Universitetscentrum, Roslagstullsbacken 21, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning
QC 20120507Tillgänglig från: 2012-05-07 Skapad: 2012-05-07 Senast uppdaterad: 2012-05-07Bibliografiskt granskad
Delarbeten
1. Increased photocurrent in quantum dot infrared photodetector by subwavelength hole array in metal thin film
Öppna denna publikation i ny flik eller fönster >>Increased photocurrent in quantum dot infrared photodetector by subwavelength hole array in metal thin film
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2010 (Engelska)Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 96, nr 23, s. 231110-Artikel i tidskrift (Refereegranskat) 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.

Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:kth:diva-27515 (URN)10.1063/1.3449117 (DOI)000278695900010 ()2-s2.0-77953508938 (Scopus ID)
Anmärkning
QC 20110111Tillgänglig från: 2011-01-11 Skapad: 2010-12-13 Senast uppdaterad: 2017-12-11Bibliografiskt granskad
2. Multiple beam splitting to free space from a V groove in a photonic crystal waveguide
Öppna denna publikation i ny flik eller fönster >>Multiple beam splitting to free space from a V groove in a photonic crystal waveguide
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2011 (Engelska)Ingår i: Applied physics. B, Lasers and optics (Print), ISSN 0946-2171, E-ISSN 1432-0649, Vol. 102, nr 4, s. 857-861Artikel i tidskrift (Refereegranskat) 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.

Nyckelord
DIRECTIONAL EMISSION; ENHANCEMENT; EMITTER
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:kth:diva-32034 (URN)10.1007/s00340-010-4285-2 (DOI)000288447300022 ()2-s2.0-79955920066 (Scopus ID)
Anmärkning
QC 20110404Tillgänglig från: 2011-04-04 Skapad: 2011-04-04 Senast uppdaterad: 2017-12-11Bibliografiskt granskad
3. Exciton Polariton Contribution to the Stokes Shift in Colloidal Quantum Dots
Öppna denna publikation i ny flik eller fönster >>Exciton Polariton Contribution to the Stokes Shift in Colloidal Quantum Dots
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2011 (Engelska)Ingår i: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 115, nr 13, s. 5286-5293Artikel i tidskrift (Refereegranskat) 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.

Nyckelord
CDS NANOCRYSTALS, DEPOSITION, ENERGY, FILMS, DARK
Nationell ämneskategori
Fysikalisk kemi
Identifikatorer
urn:nbn:se:kth:diva-32622 (URN)10.1021/jp109608t (DOI)000288885900014 ()2-s2.0-79953677832 (Scopus ID)
Anmärkning

QC 20110419

Tillgänglig från: 2011-04-19 Skapad: 2011-04-18 Senast uppdaterad: 2017-12-11Bibliografiskt granskad
4. Time-resolved photocurrents in quantum well/dot infrared photodetectors with different optical coupling structures
Öppna denna publikation i ny flik eller fönster >>Time-resolved photocurrents in quantum well/dot infrared photodetectors with different optical coupling structures
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2012 (Engelska)Ingår i: Applied Physics Letters, ISSN 0003-6951, E-ISSN 1077-3118, Vol. 100, nr 4, s. 043502-Artikel i tidskrift (Refereegranskat) 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.

Nationell ämneskategori
Fysik
Identifikatorer
urn:nbn:se:kth:diva-91623 (URN)10.1063/1.3678637 (DOI)000300064500067 ()2-s2.0-84863018238 (Scopus ID)
Anmärkning
QC 20120323Tillgänglig från: 2012-03-23 Skapad: 2012-03-19 Senast uppdaterad: 2017-12-07Bibliografiskt granskad
5. Comb-shaped photonic crystal structure for efficient broadband light diffraction and funnelling in solar cells
Öppna denna publikation i ny flik eller fönster >>Comb-shaped photonic crystal structure for efficient broadband light diffraction and funnelling in solar cells
2012 (Engelska)Ingår i: Solar Energy Materials and Solar Cells, ISSN 0927-0248, E-ISSN 1879-3398, Vol. 99, s. 316-320Artikel i tidskrift (Refereegranskat) 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.

Nyckelord
Light diffraction and funnelling, Photovoltaic, Photonic crystal, Solar cell
Nationell ämneskategori
Energiteknik
Identifikatorer
urn:nbn:se:kth:diva-92990 (URN)10.1016/j.solmat.2011.12.020 (DOI)000301167200044 ()2-s2.0-84862801322 (Scopus ID)
Anmärkning
QC 20120411Tillgänglig från: 2012-04-11 Skapad: 2012-04-10 Senast uppdaterad: 2017-12-07Bibliografiskt granskad
6. Improving efficiency of quantum dot infrared photodetector by using photonic crystal framework in the active layer
Öppna denna publikation i ny flik eller fönster >>Improving efficiency of quantum dot infrared photodetector by using photonic crystal framework in the active layer
2011 (Engelska)Konferensbidrag, Publicerat paper (Refereegranskat)
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.

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

QC 20140916

Tillgänglig från: 2012-05-07 Skapad: 2012-05-07 Senast uppdaterad: 2014-09-16Bibliografiskt granskad

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Doctoral thesis in Photonics(6259 kB)1509 nedladdningar
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