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Jun, Young Chul
Laboratory of Nanophotonics & Metamaterials (NanoMeta)
Research Interests
  • Nanophotonics, plasmonics, metamaterials, 4D printing, programmable matter, smart materials


Directional perfect absorption using deep subwavelength low-permittivity films

DC Field Value Language Luk, Ting S. ko Campione, Salvatore ko Kim, Iltai ko Feng, Simin ko Jun, Young Chul ko Liu, Sheng ko Wright, Jeremy B. ko Brener, Igal ko Catrysse, Peter B. ko Fan, Shanhui ko Sinclair, Michael B. ko 2015-09-08T00:01:30Z - 2015-09-07 ko 2014-08 -
dc.identifier.citation PHYSICAL REVIEW B, v.90, no.8, pp.085411 - ko
dc.identifier.issn 2469-9950 ko
dc.identifier.uri -
dc.identifier.uri ko
dc.description.abstract We experimentally demonstrate single beam directional perfect absorption (to within experimental accuracy) of p-polarized light in the near-infrared using unpatterned, deep subwavelength films of indium tin oxide (ITO) on Ag. The experimental perfect absorption occurs slightly above the epsilon-near-zero (ENZ) frequency of ITO, where the permittivity is less than 1 in magnitude. Remarkably, we obtain perfect absorption for films whose thickness is as low as similar to 1/50th of the operating free-space wavelength and whose single pass attenuation is only similar to 5%. We further derive simple analytical conditions for perfect absorption in the subwavelength-film regime that reveal the constraints that the thin layer permittivity must satisfy if perfect absorption is to be achieved. Then, to get a physical insight on the perfect absorption properties, we analyze the eigenmodes of the layered structure by computing both the real-frequency/complex-wavenumber and the complex-frequency/real-wavenumber modal dispersion diagrams. These analyses allow us to attribute the experimental perfect absorption condition to the crossover between bound and leaky behavior of one eigenmode of the layered structure. Both modal methods show that perfect absorption occurs at a frequency slightly larger than the ENZ frequency, in agreement with experimental results, and both methods predict a second perfect absorption condition at higher frequencies, attributed to another crossover between bound and leaky behavior of the same eigenmode. Our results greatly expand the list of materials that can be considered for use as ultrathin perfect absorbers and provide a methodology for the design of absorbing systems at any desired frequency ko
dc.description.statementofresponsibility open -
dc.language ENG ko
dc.publisher AMER PHYSICAL SOC ko
dc.subject LAYERED MEDIA ko
dc.subject ABSORBERS ko
dc.subject LIGHT ko
dc.subject THIN ko
dc.subject RESONANCE ko
dc.title Directional perfect absorption using deep subwavelength low-permittivity films ko
dc.type ARTICLE ko
dc.identifier.scopusid 2-s2.0-84907640302 ko
dc.identifier.wosid 000341164000010 ko
dc.type.rims ART ko
dc.description.wostc 9 *
dc.description.scopustc 8 * 2015-12-28 * 2015-11-04 *
dc.identifier.doi 10.1103/PhysRevB.90.085411 ko
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