| 1. | Landreman, Patrick E; Chalabi, Hamidreza; Park, Junghyun; Brongersma, Mark L: Fabry-Perot description for Mie resonances of rectangular dielectric nanowire optical resonators. In: Opt. Express, 24 , pp. 29760, 2016. (Type: Journal Article | Abstract | Links | BibTeX)@article{Landreman:2016,
title = {Fabry-Perot description for Mie resonances of rectangular dielectric nanowire optical resonators},
author = {Patrick E. Landreman and Hamidreza Chalabi and Junghyun Park and Mark L. Brongersma},
doi = {10.1364/OE.24.029760},
year = {2016},
date = {2016-12-26},
journal = {Opt. Express},
volume = {24},
pages = {29760},
abstract = {We show that a dielectric nanowire (NW) with a rectangular cross section can effectively be modeled as a Fabry-Perot cavity formed by truncating a dielectric slab waveguide. By calculating the mode indices of the supported waveguide modes and the reflection phase pickup of the guided waves from the end facets, we can numerically predict the spectral locations of optical, Mie-like resonances for such NWs. This type of analysis must be performed twice in order to account for all resonances of these structures, corresponding to light propagating in the vertical or horizontal directions. The model shows excellent agreement with full-field simulations. We show how the refractive index of both the NW itself and neighboring materials and substrates impact the resonant properties. Our results can aid the development of NW-based optoelectronic devices, for which rectangular cross sections are much simpler to fabricate using top-down fabrication procedures.},
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pubstate = {published},
tppubtype = {article}
}
We show that a dielectric nanowire (NW) with a rectangular cross section can effectively be modeled as a Fabry-Perot cavity formed by truncating a dielectric slab waveguide. By calculating the mode indices of the supported waveguide modes and the reflection phase pickup of the guided waves from the end facets, we can numerically predict the spectral locations of optical, Mie-like resonances for such NWs. This type of analysis must be performed twice in order to account for all resonances of these structures, corresponding to light propagating in the vertical or horizontal directions. The model shows excellent agreement with full-field simulations. We show how the refractive index of both the NW itself and neighboring materials and substrates impact the resonant properties. Our results can aid the development of NW-based optoelectronic devices, for which rectangular cross sections are much simpler to fabricate using top-down fabrication procedures. |
| 2. | Chalabi, Hamidreza; Alù, Andrea; and Brongersma, Mark L: Focused thermal emission from a nanostructured SiC surface. In: Phys. Rev. B, 94 , pp. 094307, 2016. (Type: Journal Article | Abstract | Links | BibTeX)@article{Chalabi:2016,
title = {Focused thermal emission from a nanostructured SiC surface},
author = {Hamidreza Chalabi and Andrea Al\`{u} and and Mark L. Brongersma},
doi = {10.1103/PhysRevB.94.094307},
year = {2016},
date = {2016-09-23},
journal = {Phys. Rev. B},
volume = {94},
pages = {094307},
abstract = {Incandescent sources that produce light from electrically heated filaments or films tend to feature low efficiencies and offer poor spectral and angular control. We demonstrate that a judicious nanostructuring of a SiC surface can focus thermal emission of a preselected spectral range to a well-defined height above the surface. SiC is known to support electromagnetic surface waves that afford the required thermal emission control. Here, we provide general design rules for this type of focusing element that can be extended to other material systems, such as metals supporting surface plasmon-polariton waves. These rules are verified using full-wave calculations of the spatial variation of thermal emission. The obtained results establish a foundation for developing more complex algorithms for the design of complex thermal lenses.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
Incandescent sources that produce light from electrically heated filaments or films tend to feature low efficiencies and offer poor spectral and angular control. We demonstrate that a judicious nanostructuring of a SiC surface can focus thermal emission of a preselected spectral range to a well-defined height above the surface. SiC is known to support electromagnetic surface waves that afford the required thermal emission control. Here, we provide general design rules for this type of focusing element that can be extended to other material systems, such as metals supporting surface plasmon-polariton waves. These rules are verified using full-wave calculations of the spatial variation of thermal emission. The obtained results establish a foundation for developing more complex algorithms for the design of complex thermal lenses. |
| 3. | Chalabi, Hamidreza; Hasman, Erez; Brongersma, Mark L: Effect of shape in near-field thermal transfer for periodic structures. In: Phys. Rev. B, 91 (17), pp. 174304, 2015. (Type: Journal Article | Abstract | Links | BibTeX)@article{Chalabi:2015b,
title = {Effect of shape in near-field thermal transfer for periodic structures},
author = { Hamidreza Chalabi and Erez Hasman and Mark L. Brongersma},
doi = {10.1103/PhysRevB.91.174304},
year = {2015},
date = {2015-05-26},
journal = {Phys. Rev. B},
volume = {91},
number = {17},
pages = {174304},
publisher = {American Physical Society},
abstract = {In this paper, the effect of the geometrical shape on the radiative thermal transfer between a periodic array of beams and a planar substrate is investigated. Specifically, we analyze the changes in the thermal transfer that occur when the cross-sectional shape of SiC beams is modified from rectangular to ellipsoidal and finally triangular. Numerical calculations are done based on the rigorous coupled wave analysis. These exact results from this analysis are compared to modified proximity and far-field approximations, which become valid for small and large spacings, respectively. Moreover, these results are also compared to effective medium theory, which becomes increasingly accurate in the limit of small periodicities. We show that a reduction in the periodicity will lead to a reduced thermal transfer for triangular and ellipsoidal shaped beams. Even though, in the limit of very small periodicity, thermal transfer for the case of rectangular shaped beams also decreases by decreasing the periodicity, this decrease is slower as compared to other cross-sectional shapes. Finally, we show that even though changing periodicity will change the magnitude of thermal transfer, the scaling law for its variation with the beam to substrate spacing is primarily determined by the cross-sectional shape rather than the periodicity. We analytically prove this fact by investigating the large and small periodicity regimes.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
In this paper, the effect of the geometrical shape on the radiative thermal transfer between a periodic array of beams and a planar substrate is investigated. Specifically, we analyze the changes in the thermal transfer that occur when the cross-sectional shape of SiC beams is modified from rectangular to ellipsoidal and finally triangular. Numerical calculations are done based on the rigorous coupled wave analysis. These exact results from this analysis are compared to modified proximity and far-field approximations, which become valid for small and large spacings, respectively. Moreover, these results are also compared to effective medium theory, which becomes increasingly accurate in the limit of small periodicities. We show that a reduction in the periodicity will lead to a reduced thermal transfer for triangular and ellipsoidal shaped beams. Even though, in the limit of very small periodicity, thermal transfer for the case of rectangular shaped beams also decreases by decreasing the periodicity, this decrease is slower as compared to other cross-sectional shapes. Finally, we show that even though changing periodicity will change the magnitude of thermal transfer, the scaling law for its variation with the beam to substrate spacing is primarily determined by the cross-sectional shape rather than the periodicity. We analytically prove this fact by investigating the large and small periodicity regimes. |
| 4. | Chalabi, Hamidreza; Hasman, Erez; Brongersma, Mark L: Near-field radiative thermal transfer between a nanostructured periodic material and a planar substrate. In: Phys. Rev. B, 91 , pp. 014302, 2015. (Type: Journal Article | Abstract | Links | BibTeX)@article{Chalabi:2015a,
title = {Near-field radiative thermal transfer between a nanostructured periodic material and a planar substrate},
author = { Hamidreza Chalabi and Erez Hasman and Mark L Brongersma},
doi = {10.1103/PhysRevB.91.014302},
year = {2015},
date = {2015-01-06},
journal = {Phys. Rev. B},
volume = {91},
pages = {014302},
publisher = {APS},
abstract = {This paper provides a method based on rigorous coupled wave analysis for the calculation of the radiative thermal conductance between a layer that is patterned with arbitrary, periodically repeating features and a planar substrate. This method is applied to study the transfer from an array of beams with a rectangular cross section. The impact of the structure size and spacing on the thermal conductance are investigated. These calculations are compared to an effective medium theory, which becomes increasingly accurate as the structure sizes fall well below the relevant resonance wavelengths of materials and structures. Moreover, comparisons are made with a modified proximity approximation and the far-field approximation, which become valid for small and large spacings, respectively. Results show that new levels of control over the magnitude and spectral contributions to thermal conductance can be achieved with corrugated structures relative to planar ones. Specifically, we show for SiC arrays with rectangular cross sections and with the same filling fraction, that the use of a smaller periodicity leads to a lowered far-field thermal transfer and an increased near-field thermal transfer.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
This paper provides a method based on rigorous coupled wave analysis for the calculation of the radiative thermal conductance between a layer that is patterned with arbitrary, periodically repeating features and a planar substrate. This method is applied to study the transfer from an array of beams with a rectangular cross section. The impact of the structure size and spacing on the thermal conductance are investigated. These calculations are compared to an effective medium theory, which becomes increasingly accurate as the structure sizes fall well below the relevant resonance wavelengths of materials and structures. Moreover, comparisons are made with a modified proximity approximation and the far-field approximation, which become valid for small and large spacings, respectively. Results show that new levels of control over the magnitude and spectral contributions to thermal conductance can be achieved with corrugated structures relative to planar ones. Specifically, we show for SiC arrays with rectangular cross sections and with the same filling fraction, that the use of a smaller periodicity leads to a lowered far-field thermal transfer and an increased near-field thermal transfer. |
| 5. | Chalabi, Hamidreza; Hasman, Erez; Brongersma, Mark L: An ab-initio coupled mode theory for near field radiative thermal transfer. In: Optics express, 22 (24), pp. 30032–30046, 2014. (Type: Journal Article | BibTeX)@article{chalabi2014abb,
title = {An ab-initio coupled mode theory for near field radiative thermal transfer},
author = { Hamidreza Chalabi and Erez Hasman and Mark L Brongersma},
year = {2014},
date = {2014-01-01},
journal = {Optics express},
volume = {22},
number = {24},
pages = {30032--30046},
publisher = {Optical Society of America},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
| 6. | Chalabi, Hamidreza; Schoen, David; Brongersma, Mark L: Hot-electron photodetection with a plasmonic nanostripe antenna. In: Nano letters, 14 (3), pp. 1374–1380, 2014. (Type: Journal Article | BibTeX)@article{chalabi2014hotb,
title = {Hot-electron photodetection with a plasmonic nanostripe antenna},
author = { Hamidreza Chalabi and David Schoen and Mark L Brongersma},
year = {2014},
date = {2014-01-01},
journal = {Nano letters},
volume = {14},
number = {3},
pages = {1374--1380},
publisher = {ACS Publications},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
| 7. | Chalabi, Hamidreza; Brongersma, Mark L: Plasmonics: Harvest season for hot electrons. In: Nature nanotechnology, 8 (4), pp. 229–230, 2013. (Type: Journal Article | BibTeX)@article{chalabi2013plasmonics,
title = {Plasmonics: Harvest season for hot electrons},
author = { Hamidreza Chalabi and Mark L Brongersma},
year = {2013},
date = {2013-01-01},
journal = {Nature nanotechnology},
volume = {8},
number = {4},
pages = {229--230},
publisher = {Nature Publishing Group},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
|
