Abstract
Nearly all known electrically thin perfect absorbers are asymmetric with respect to their two sides and show perfect (rather, nearly perfect) absorption only from one side of the absorbing layer. Moreover, the vast majority of the designs contain a ground plane, which makes the transmission coefficient zero at all relevant frequencies. Here, we introduce a simple symmetric configuration of a single infinite grating of perfectly conducting rods coated by ordinary dielectrics as a symmetric single-layer perfect absorber not containing any impenetrable layers. With the goal to examine its capacity to absorb electromagnetic radiation, we replace each cylinder by a pair of dipole lines and derive the conditions for the perfect absorption (zero reflection and zero transmission) in terms of their dipole moments. It is a general approach that is not limited to circular cylinders or homogeneous textures; in this way, the generic concept of carrying over properties from simpler tomore complicated structures, is realized. A metric of fulfilling the aforementioned two requirements for perfect absorption is defined and evaluated for a number of different cases. A realistic example design demonstrating 96%-97% absorption is presented. The performance can be increased further to reach 98% absorption in case of permitting arbitrary permittivities.
| Original language | English |
|---|---|
| Article number | 2340891 |
| Pages (from-to) | 5089-5098 |
| Number of pages | 10 |
| Journal | IEEE Transactions on Antennas and Propagation |
| Volume | 62 |
| Issue number | 10 |
| DOIs | |
| Publication status | Published - Oct 1 2014 |
| Externally published | Yes |
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Keywords
- Absorber
- Dipole line
- Equivalent moment
- Infinite grating
ASJC Scopus subject areas
- Electrical and Electronic Engineering
- Condensed Matter Physics
Cite this
Symmetric absorbers realized as gratings of PEC cylinders covered by ordinary dielectrics. / Valagiannopoulos, Constantinos A.; Tretyakov, Sergei A.
In: IEEE Transactions on Antennas and Propagation, Vol. 62, No. 10, 2340891, 01.10.2014, p. 5089-5098.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Symmetric absorbers realized as gratings of PEC cylinders covered by ordinary dielectrics
AU - Valagiannopoulos, Constantinos A.
AU - Tretyakov, Sergei A.
PY - 2014/10/1
Y1 - 2014/10/1
N2 - Nearly all known electrically thin perfect absorbers are asymmetric with respect to their two sides and show perfect (rather, nearly perfect) absorption only from one side of the absorbing layer. Moreover, the vast majority of the designs contain a ground plane, which makes the transmission coefficient zero at all relevant frequencies. Here, we introduce a simple symmetric configuration of a single infinite grating of perfectly conducting rods coated by ordinary dielectrics as a symmetric single-layer perfect absorber not containing any impenetrable layers. With the goal to examine its capacity to absorb electromagnetic radiation, we replace each cylinder by a pair of dipole lines and derive the conditions for the perfect absorption (zero reflection and zero transmission) in terms of their dipole moments. It is a general approach that is not limited to circular cylinders or homogeneous textures; in this way, the generic concept of carrying over properties from simpler tomore complicated structures, is realized. A metric of fulfilling the aforementioned two requirements for perfect absorption is defined and evaluated for a number of different cases. A realistic example design demonstrating 96%-97% absorption is presented. The performance can be increased further to reach 98% absorption in case of permitting arbitrary permittivities.
AB - Nearly all known electrically thin perfect absorbers are asymmetric with respect to their two sides and show perfect (rather, nearly perfect) absorption only from one side of the absorbing layer. Moreover, the vast majority of the designs contain a ground plane, which makes the transmission coefficient zero at all relevant frequencies. Here, we introduce a simple symmetric configuration of a single infinite grating of perfectly conducting rods coated by ordinary dielectrics as a symmetric single-layer perfect absorber not containing any impenetrable layers. With the goal to examine its capacity to absorb electromagnetic radiation, we replace each cylinder by a pair of dipole lines and derive the conditions for the perfect absorption (zero reflection and zero transmission) in terms of their dipole moments. It is a general approach that is not limited to circular cylinders or homogeneous textures; in this way, the generic concept of carrying over properties from simpler tomore complicated structures, is realized. A metric of fulfilling the aforementioned two requirements for perfect absorption is defined and evaluated for a number of different cases. A realistic example design demonstrating 96%-97% absorption is presented. The performance can be increased further to reach 98% absorption in case of permitting arbitrary permittivities.
KW - Absorber
KW - Dipole line
KW - Equivalent moment
KW - Infinite grating
UR - http://www.scopus.com/inward/record.url?scp=84908053130&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84908053130&partnerID=8YFLogxK
U2 - 10.1109/TAP.2014.2340891
DO - 10.1109/TAP.2014.2340891
M3 - Article
AN - SCOPUS:84908053130
VL - 62
SP - 5089
EP - 5098
JO - IEEE Transactions on Antennas and Propagation
JF - IEEE Transactions on Antennas and Propagation
SN - 0018-926X
IS - 10
M1 - 2340891
ER -