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Imaging for subwavelength information with layered metamaterials
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH , 2010. , viii, 57 p.
Series
Trita-MMK, ISSN 1400-1179 ; 2010:3
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-12467OAI: oai:DiVA.org:kth-12467DiVA: diva2:312942
Public defence
2010-04-30, Room D3, Entreplanet, Lindstedtsv 5, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC20100617Available from: 2010-04-26 Created: 2010-04-26 Last updated: 2010-06-17Bibliographically approved
List of papers
1. Subwavelength focusing with a multilayered Fabry-Perot structure at optical frequencies
Open this publication in new window or tab >>Subwavelength focusing with a multilayered Fabry-Perot structure at optical frequencies
2007 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 75, no 4, 045103- p.Article in journal (Refereed) Published
Abstract [en]

The Fabry-Perot resonance effect is studied in order to achieve subwavelength imaging at a far distance (e.g., about 10 wavelengths) from the source at optical frequencies. Two different structures (with matched and mismatched impedances) of alternative metal and air layers are considered first at a relatively short distance (e.g., about one wavelength) from the source. It is found that the impedance match is not necessary for subwavelength focusing since the Fabry-Perot resonance effect is utilized here. An appropriate period is chosen so that the Fabry-Perot resonance occurs in an evanescent regime, and consequently the evanescent waves near the Fabry-Perot resonance peak are amplified. With such a mechanism, a super lens with a resolution of about λ0/30 (λ0 is the wavelength in the air), acceptable sidelobes and a larger displacement range (when the thickness of the period is within such a displacement range, subwavelength focusing with acceptable sidelobes can be achieved) is designed. Subwavelength focusing (with a spotsize of λ0/12) at a distance far away from the source is also realized in the presence of some material loss.

Keyword
PERFECT LENS, NEAR-FIELD
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-12461 (URN)10.1103/PhysRevB.75.045103 (DOI)000243895600020 ()2-s2.0-33846352516 (Scopus ID)
Note
QC20100617Available from: 2010-04-26 Created: 2010-04-26 Last updated: 2013-11-19Bibliographically approved
2. Appropriate interface termination to improve imaging resolution of multilayered structures in the infrared and optical canalization regime
Open this publication in new window or tab >>Appropriate interface termination to improve imaging resolution of multilayered structures in the infrared and optical canalization regime
2008 (English)In: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION, ISSN 1084-7529, Vol. 25, no 8, 1861-1865 p.Article in journal (Refereed) Published
Abstract [en]

Appropriate surface termination is used to improve dramatically the subwavelength imaging resolution of a multilavered positive-negative permittivity structure operating in the infrared or optical canalization regime. The imaging resolution of the improved multilayered structure resists practical material loss well, and it is not sensitive to the thickness of the interface layers, the total thickness, nor the period of the multilayered structure. Such a structure can be used to transfer a subwavelength image to a far distance through a thick structure.

Identifiers
urn:nbn:se:kth:diva-12462 (URN)000258697700003 ()2-s2.0-55049112183 (Scopus ID)
Note
QC20100617Available from: 2010-04-26 Created: 2010-04-26 Last updated: 2010-06-17Bibliographically approved
3. Optimized effective permittivity to improve imaging resolution of multilayered structures in the infrared
Open this publication in new window or tab >>Optimized effective permittivity to improve imaging resolution of multilayered structures in the infrared
2009 (English)In: J OPT SOC AM A-OPT IMAGE SCI, ISSN 1084-7529, Vol. 26, no 2, 365-370 p.Article in journal (Refereed) Published
Abstract [en]

Two periodic structures with different effective impedances, both comprising alternate layers of a positive and a negative permittivity material, are considered in the infrared. We find that the Fabry-Perot resonance effect periodically influences the sharpness of subwavelength focusing as the total thicknesses of the two structures increase, especially for the impedance-matched structure. On the basis of the improved multilayered structures, we design an optimized structure (i.e., the effective impedance is chosen between 0 and 1) for which a higher resolution less than lambda/12 (lambda is the wavelength in the air) can be obtained through weighing the advantages and disadvantages of the two different multilayered structures and choosing appropriate surface terminations.

Keyword
PHOTONIC CRYSTAL
Identifiers
urn:nbn:se:kth:diva-12463 (URN)000264036500020 ()2-s2.0-60949112109 (Scopus ID)
Note
QC20100617Available from: 2010-04-26 Created: 2010-04-26 Last updated: 2010-06-17Bibliographically approved
4. Multilayered structures with high subwavelength resolution based on the metal-dielectric composites
Open this publication in new window or tab >>Multilayered structures with high subwavelength resolution based on the metal-dielectric composites
2009 (English)In: J OPT SOC AM A-OPT IMAGE SCI, ISSN 1084-7529, Vol. 26, no 12, 2521-2525 p.Article in journal (Refereed) Published
Abstract [en]

Pure noble metals are usually considered to be negative-permittivity materials for multilayered structures. Such structures can produce flat equal-frequency contours and achieve subwavelength resolution by enabling all propagating and partial evanescent components of the source radiation to be transformed into propagating harmonics. We show that using a composite metal-dielectric layer with an appropriate metal filling factor instead of a negative-permittivity layer can facilitate operation at practically any desired wavelength and achieve good resolution (0.057 lambda) and that appropriate surface termination can improve the quality of imaging effectively.

Keyword
NEGATIVE REFRACTION, PERFECT LENS, CONSTANTS
Identifiers
urn:nbn:se:kth:diva-12460 (URN)000272349500006 ()2-s2.0-73349097853 (Scopus ID)
Note
QC20100617Available from: 2010-04-26 Created: 2010-04-26 Last updated: 2010-06-17Bibliographically approved
5. Hyperlens with non-negative effective permittivities and increasing layer thickness
Open this publication in new window or tab >>Hyperlens with non-negative effective permittivities and increasing layer thickness
(English)In: Journal of the Optical Society of America A, ISSN 0740-3232Article in journal (Refereed) Submitted
Identifiers
urn:nbn:se:kth:diva-13405 (URN)
Note
QS 20120328Available from: 2010-06-17 Created: 2010-06-17 Last updated: 2012-03-28Bibliographically approved

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