TY  - CONF
AU  - Dalarsson, Mariana
AU  - Jakšić, Zoran
PY  - 2017
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/3444
AB  - We propose a method to determine approximate phase-integral analytical solutions for electric and magnetic fields in flat lenses with the refractive index varying in the radial direction. In our model the gradient of refractive index is approximated by a large number of concentric annuli with step-increasing index. Here the central part contributes to a bulk of the phase transformation, while the external layers act as a graded antireflective structure, matching the impedance of the lens to that of the free space. Such lenses can be modeled as compact composites with continuous permittivity and (if needed) permeability functions which asymptotically approach unity at the boundaries of the composite cylinder. We illustrate the phase-integral approach by obtaining the approximate analytic solutions for the electric and magnetic fields for a special class of composite designs with radially graded parameters.
PB  - Institute of Electrical and Electronics Engineers (IEEE)
C3  - 13th International Conference on Advanced Technologies, Systems and Services in Telecommunications (TELSIKS) - Proceedings of Papers
T1  - Phase integral approach to wave propagation in continuously graded models of flat lenses
SP  - 38
EP  - 41
DO  - 10.1109/TELSKS.2017.8246222
ER  - 

@conference{
author = "Dalarsson, Mariana and Jakšić, Zoran",
year = "2017",
abstract = "We propose a method to determine approximate phase-integral analytical solutions for electric and magnetic fields in flat lenses with the refractive index varying in the radial direction. In our model the gradient of refractive index is approximated by a large number of concentric annuli with step-increasing index. Here the central part contributes to a bulk of the phase transformation, while the external layers act as a graded antireflective structure, matching the impedance of the lens to that of the free space. Such lenses can be modeled as compact composites with continuous permittivity and (if needed) permeability functions which asymptotically approach unity at the boundaries of the composite cylinder. We illustrate the phase-integral approach by obtaining the approximate analytic solutions for the electric and magnetic fields for a special class of composite designs with radially graded parameters.",
publisher = "Institute of Electrical and Electronics Engineers (IEEE)",
journal = "13th International Conference on Advanced Technologies, Systems and Services in Telecommunications (TELSIKS) - Proceedings of Papers",
title = "Phase integral approach to wave propagation in continuously graded models of flat lenses",
pages = "38-41",
doi = "10.1109/TELSKS.2017.8246222"
}

Dalarsson, M.,& Jakšić, Z.. (2017). Phase integral approach to wave propagation in continuously graded models of flat lenses. in 13th International Conference on Advanced Technologies, Systems and Services in Telecommunications (TELSIKS) - Proceedings of Papers
Institute of Electrical and Electronics Engineers (IEEE)., 38-41.
https://doi.org/10.1109/TELSKS.2017.8246222

Dalarsson M, Jakšić Z. Phase integral approach to wave propagation in continuously graded models of flat lenses. in 13th International Conference on Advanced Technologies, Systems and Services in Telecommunications (TELSIKS) - Proceedings of Papers. 2017;:38-41.
doi:10.1109/TELSKS.2017.8246222 .

Dalarsson, Mariana, Jakšić, Zoran, "Phase integral approach to wave propagation in continuously graded models of flat lenses" in 13th International Conference on Advanced Technologies, Systems and Services in Telecommunications (TELSIKS) - Proceedings of Papers (2017):38-41,
https://doi.org/10.1109/TELSKS.2017.8246222 . .

TY  - CONF
AU  - Jakšić, Zoran
AU  - Smiljanić, Milče M.
AU  - Lazić, Žarko
AU  - Radulović, Katarina
AU  - Dalarsson, Mariana
AU  - Tanasković, Dragan
AU  - Obradov, Marko
AU  - Jakšić, Olga
PY  - 2015
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5732
AB  - Plasmonic structures ensure electromagnetic field localization and concentration within subwavelength volumes, thus enabling numerous practical applications. Structuring at
levels much below the operating wavelength can be used to obtain novel electromagnetic modes, an example being the designer plasmon structures where one utilizes ordered arrays of
subwavelength holes to mimic the behavior of metals in different frequency ranges and obtain the designer (spoof) plasmons, surface waves with a resonant frequency tailorable by design in a
wide range. In this paper we consider structures with aperturebased pattern that use aluminum for the negative permittivity part instead of the usual gold or silver. We experimentally investigate patterns with complex aperture shapes which ensure richer modal behavior of the structures, including a possibility to customize their frequency dispersion and to obtain tailorable deeply subwavelength electromagnetic field hotspots. To this purpose we utilize the proximity effects (field concentration in deep subwavelength gaps) and the edge effects (localization on sharp corners). We conclude that a new degree of design freedom is obtained when utilizing aluminum-based aperture arrays and that the proximity and edge effects at a deep subwavelength level
can be used to enhance the effects of spoof plasmons. It is important at that to take into account the influence of native oxide of aluminum that appears in practical structures, as well as the increased absorption losses.
PB  - Beograd : Društvo za ETRAN / Belgrade : ETRAN Society
C3  - Proceedings - 2nd International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2015
T1  - Aluminum-based fishnets with complex aperture shapes
SP  - MOI3.2.1
EP  - MOI3.2.5
UR  - https://hdl.handle.net/21.15107/rcub_cer_5732
ER  - 

@conference{
author = "Jakšić, Zoran and Smiljanić, Milče M. and Lazić, Žarko and Radulović, Katarina and Dalarsson, Mariana and Tanasković, Dragan and Obradov, Marko and Jakšić, Olga",
year = "2015",
abstract = "Plasmonic structures ensure electromagnetic field localization and concentration within subwavelength volumes, thus enabling numerous practical applications. Structuring at
levels much below the operating wavelength can be used to obtain novel electromagnetic modes, an example being the designer plasmon structures where one utilizes ordered arrays of
subwavelength holes to mimic the behavior of metals in different frequency ranges and obtain the designer (spoof) plasmons, surface waves with a resonant frequency tailorable by design in a
wide range. In this paper we consider structures with aperturebased pattern that use aluminum for the negative permittivity part instead of the usual gold or silver. We experimentally investigate patterns with complex aperture shapes which ensure richer modal behavior of the structures, including a possibility to customize their frequency dispersion and to obtain tailorable deeply subwavelength electromagnetic field hotspots. To this purpose we utilize the proximity effects (field concentration in deep subwavelength gaps) and the edge effects (localization on sharp corners). We conclude that a new degree of design freedom is obtained when utilizing aluminum-based aperture arrays and that the proximity and edge effects at a deep subwavelength level
can be used to enhance the effects of spoof plasmons. It is important at that to take into account the influence of native oxide of aluminum that appears in practical structures, as well as the increased absorption losses.",
publisher = "Beograd : Društvo za ETRAN / Belgrade : ETRAN Society",
journal = "Proceedings - 2nd International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2015",
title = "Aluminum-based fishnets with complex aperture shapes",
pages = "MOI3.2.1-MOI3.2.5",
url = "https://hdl.handle.net/21.15107/rcub_cer_5732"
}

Jakšić, Z., Smiljanić, M. M., Lazić, Ž., Radulović, K., Dalarsson, M., Tanasković, D., Obradov, M.,& Jakšić, O.. (2015). Aluminum-based fishnets with complex aperture shapes. in Proceedings - 2nd International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2015
Beograd : Društvo za ETRAN / Belgrade : ETRAN Society., MOI3.2.1-MOI3.2.5.
https://hdl.handle.net/21.15107/rcub_cer_5732

Jakšić Z, Smiljanić MM, Lazić Ž, Radulović K, Dalarsson M, Tanasković D, Obradov M, Jakšić O. Aluminum-based fishnets with complex aperture shapes. in Proceedings - 2nd International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2015. 2015;:MOI3.2.1-MOI3.2.5.
https://hdl.handle.net/21.15107/rcub_cer_5732 .

Jakšić, Zoran, Smiljanić, Milče M., Lazić, Žarko, Radulović, Katarina, Dalarsson, Mariana, Tanasković, Dragan, Obradov, Marko, Jakšić, Olga, "Aluminum-based fishnets with complex aperture shapes" in Proceedings - 2nd International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2015 (2015):MOI3.2.1-MOI3.2.5,
https://hdl.handle.net/21.15107/rcub_cer_5732 .

TY  - JOUR
AU  - Jakšić, Zoran
AU  - Sarajlić, Milija
AU  - Lazić, Žarko
AU  - Dalarsson, Mariana
AU  - Randjelović, Danijela
AU  - Radulović, Katarina
AU  - Tanasković, Dragan
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1170
AB  - We investigate theoretically and experimentally a binary metal-dielectric metamaterial with a sawtooth profile. The structure consists of a two-dimensional array of pillars with submicrometer diameters. The pillar diameters linearly vary along one axis and are constant along the other. This furnishes a serrated spatial profile of effective refractive index along a single axis. We first present a set of analytical solutions defining the electromagnetic fields in such a structure. Further we give the results of our experimental fabrication of gradient metamaterial with a sawtooth spatial profile. The basic material for pillars was photoresist. Their geometry was defined using direct laser writing. Resist was overexposed in controlled manner in order to obtain pillars with diameters below the nominal resolution of the laser writer. The microfabricated pillars were coated by a sputter-deposited aluminum film. For characterization we utilized optical and atomic force microscopy and angledependent Fourier Transform infrared spectroscopy. We envision the applicability of our graded metasurfaces in transformation optics.
PB  - Udruženje za mikrotalasnu tehniku i tehnologiju i IEEE MTT-S Chapter-a Srbije, Beograd
T2  - Mikrotalasna revija
T1  - Two-dimensional gradient-index metamaterial with sawtooth profile
VL  - 19
IS  - 2
SP  - 96
EP  - 101
UR  - https://hdl.handle.net/21.15107/rcub_cer_1170
ER  - 

@article{
author = "Jakšić, Zoran and Sarajlić, Milija and Lazić, Žarko and Dalarsson, Mariana and Randjelović, Danijela and Radulović, Katarina and Tanasković, Dragan",
year = "2013",
abstract = "We investigate theoretically and experimentally a binary metal-dielectric metamaterial with a sawtooth profile. The structure consists of a two-dimensional array of pillars with submicrometer diameters. The pillar diameters linearly vary along one axis and are constant along the other. This furnishes a serrated spatial profile of effective refractive index along a single axis. We first present a set of analytical solutions defining the electromagnetic fields in such a structure. Further we give the results of our experimental fabrication of gradient metamaterial with a sawtooth spatial profile. The basic material for pillars was photoresist. Their geometry was defined using direct laser writing. Resist was overexposed in controlled manner in order to obtain pillars with diameters below the nominal resolution of the laser writer. The microfabricated pillars were coated by a sputter-deposited aluminum film. For characterization we utilized optical and atomic force microscopy and angledependent Fourier Transform infrared spectroscopy. We envision the applicability of our graded metasurfaces in transformation optics.",
publisher = "Udruženje za mikrotalasnu tehniku i tehnologiju i IEEE MTT-S Chapter-a Srbije, Beograd",
journal = "Mikrotalasna revija",
title = "Two-dimensional gradient-index metamaterial with sawtooth profile",
volume = "19",
number = "2",
pages = "96-101",
url = "https://hdl.handle.net/21.15107/rcub_cer_1170"
}

Jakšić, Z., Sarajlić, M., Lazić, Ž., Dalarsson, M., Randjelović, D., Radulović, K.,& Tanasković, D.. (2013). Two-dimensional gradient-index metamaterial with sawtooth profile. in Mikrotalasna revija
Udruženje za mikrotalasnu tehniku i tehnologiju i IEEE MTT-S Chapter-a Srbije, Beograd., 19(2), 96-101.
https://hdl.handle.net/21.15107/rcub_cer_1170

Jakšić Z, Sarajlić M, Lazić Ž, Dalarsson M, Randjelović D, Radulović K, Tanasković D. Two-dimensional gradient-index metamaterial with sawtooth profile. in Mikrotalasna revija. 2013;19(2):96-101.
https://hdl.handle.net/21.15107/rcub_cer_1170 .

Jakšić, Zoran, Sarajlić, Milija, Lazić, Žarko, Dalarsson, Mariana, Randjelović, Danijela, Radulović, Katarina, Tanasković, Dragan, "Two-dimensional gradient-index metamaterial with sawtooth profile" in Mikrotalasna revija, 19, no. 2 (2013):96-101,
https://hdl.handle.net/21.15107/rcub_cer_1170 .

TY  - CONF
AU  - Jakšić, Zoran
AU  - Sarajlić, Milija
AU  - Lazić, Žarko
AU  - Dalarsson, Mariana
AU  - Dalarsson, Nils
AU  - Randjelović, Danijela
AU  - Radulović, Katarina
AU  - Tanasković, Dragan
PY  - 2013
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/1375
AB  - This paper presents the design and microfabrication of a two-dimensional metal-dielectric metamaterial structure based on an array of pillars with submicrometer diameters and heights. The diameters of pillars periodically vary along one axis in a sawtooth fashion and are constant along the other. The electromagnetic field distribution within this graded metamaterial was considered utilizing an accurate analytical approach. The pillar arrays were fabricated in photoresist and subsequently covered with a sputter-deposited aluminum film Structures were defined by direct laser writing in photoresist film Controlled overexposure has been applied in order to make pillar features smaller than the nominal resolution of the equipment. The structures were characterized by optical and atomic force microscopy and by angle-dependent Fourier Transform infrared spectroscopy. The produced graded frequency-selective surfaces may be used e.g. in sensing.
C3  - 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting
T1  - Gradient-Index Infrared Metamaterials Based on Metal-Dielectric Submicrometer Pillar Arrays
SP  - 21
EP  - 24
DO  - 10.1109/TELSKS.2013.6704885
ER  - 

@conference{
author = "Jakšić, Zoran and Sarajlić, Milija and Lazić, Žarko and Dalarsson, Mariana and Dalarsson, Nils and Randjelović, Danijela and Radulović, Katarina and Tanasković, Dragan",
year = "2013",
abstract = "This paper presents the design and microfabrication of a two-dimensional metal-dielectric metamaterial structure based on an array of pillars with submicrometer diameters and heights. The diameters of pillars periodically vary along one axis in a sawtooth fashion and are constant along the other. The electromagnetic field distribution within this graded metamaterial was considered utilizing an accurate analytical approach. The pillar arrays were fabricated in photoresist and subsequently covered with a sputter-deposited aluminum film Structures were defined by direct laser writing in photoresist film Controlled overexposure has been applied in order to make pillar features smaller than the nominal resolution of the equipment. The structures were characterized by optical and atomic force microscopy and by angle-dependent Fourier Transform infrared spectroscopy. The produced graded frequency-selective surfaces may be used e.g. in sensing.",
journal = "11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting",
title = "Gradient-Index Infrared Metamaterials Based on Metal-Dielectric Submicrometer Pillar Arrays",
pages = "21-24",
doi = "10.1109/TELSKS.2013.6704885"
}

Jakšić, Z., Sarajlić, M., Lazić, Ž., Dalarsson, M., Dalarsson, N., Randjelović, D., Radulović, K.,& Tanasković, D.. (2013). Gradient-Index Infrared Metamaterials Based on Metal-Dielectric Submicrometer Pillar Arrays. in 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting, 21-24.
https://doi.org/10.1109/TELSKS.2013.6704885

Jakšić Z, Sarajlić M, Lazić Ž, Dalarsson M, Dalarsson N, Randjelović D, Radulović K, Tanasković D. Gradient-Index Infrared Metamaterials Based on Metal-Dielectric Submicrometer Pillar Arrays. in 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting. 2013;:21-24.
doi:10.1109/TELSKS.2013.6704885 .

Jakšić, Zoran, Sarajlić, Milija, Lazić, Žarko, Dalarsson, Mariana, Dalarsson, Nils, Randjelović, Danijela, Radulović, Katarina, Tanasković, Dragan, "Gradient-Index Infrared Metamaterials Based on Metal-Dielectric Submicrometer Pillar Arrays" in 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting (2013):21-24,
https://doi.org/10.1109/TELSKS.2013.6704885 . .

TY  - JOUR
AU  - Dalarsson, Mariana
AU  - Norgren, Martin
AU  - Dončov, Nebojša
AU  - Jakšić, Zoran
PY  - 2012
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/4632
AB  - A remarkably simple exact analytical solution is obtained for the electromagnetic field distribution across infinite metamaterial-containing composites with any arbitrary periodic variation of complex effective permittivity and permeability for the case of constant impedance across the structure. Arbitrary temporal dispersion and losses are allowed and the model is generally applicable to different inhomogeneous and anisotropic media simultaneously containing positive and negative refractive index constituents, as long as the effective medium approximation remains valid. The analytical solution is validated by a dispersive numerical model of lossy metamaterials that uses a transmission line matrix method based on Z-transforms, where a close agreement between the analytic and numerical results is obtained.
PB  - IOP Publishing
T2  - Journal of Optics
T1  - Lossy gradient index transmission optics with arbitrary periodic permittivity and permeability and constant impedance throughout the structure
VL  - 14
IS  - 6
SP  - 065102
DO  - 10.1088/2040-8978/14/6/065102
ER  - 

@article{
author = "Dalarsson, Mariana and Norgren, Martin and Dončov, Nebojša and Jakšić, Zoran",
year = "2012",
abstract = "A remarkably simple exact analytical solution is obtained for the electromagnetic field distribution across infinite metamaterial-containing composites with any arbitrary periodic variation of complex effective permittivity and permeability for the case of constant impedance across the structure. Arbitrary temporal dispersion and losses are allowed and the model is generally applicable to different inhomogeneous and anisotropic media simultaneously containing positive and negative refractive index constituents, as long as the effective medium approximation remains valid. The analytical solution is validated by a dispersive numerical model of lossy metamaterials that uses a transmission line matrix method based on Z-transforms, where a close agreement between the analytic and numerical results is obtained.",
publisher = "IOP Publishing",
journal = "Journal of Optics",
title = "Lossy gradient index transmission optics with arbitrary periodic permittivity and permeability and constant impedance throughout the structure",
volume = "14",
number = "6",
pages = "065102",
doi = "10.1088/2040-8978/14/6/065102"
}

Dalarsson, M., Norgren, M., Dončov, N.,& Jakšić, Z.. (2012). Lossy gradient index transmission optics with arbitrary periodic permittivity and permeability and constant impedance throughout the structure. in Journal of Optics
IOP Publishing., 14(6), 065102.
https://doi.org/10.1088/2040-8978/14/6/065102

Dalarsson M, Norgren M, Dončov N, Jakšić Z. Lossy gradient index transmission optics with arbitrary periodic permittivity and permeability and constant impedance throughout the structure. in Journal of Optics. 2012;14(6):065102.
doi:10.1088/2040-8978/14/6/065102 .

Dalarsson, Mariana, Norgren, Martin, Dončov, Nebojša, Jakšić, Zoran, "Lossy gradient index transmission optics with arbitrary periodic permittivity and permeability and constant impedance throughout the structure" in Journal of Optics, 14, no. 6 (2012):065102,
https://doi.org/10.1088/2040-8978/14/6/065102 . .