Switching photonic nanostructures between cloaking and superscattering regimes using phase-change materials
Abstract
We show that phase-change materials can be used to switch photonic nanostructures between cloaking and superscattering regimes at mid-infrared wavelengths. More specifically, we investigate the scattering properties of subwavelength three-layer cylindrical structures in which the material in the outer shell is the phase-change material Ge_2Sb_2Te_5 (GST). We first show that, when GST is switched between its amorphous and crystalline phases, properly designed electrically small structures can switch between resonant scattering and cloaking invisibility regimes. The contrast ratio between the scattering cross sections of the cloaking invisibility and resonant scattering regimes reaches almost unity. We then also show that larger, moderately small cylindrical structures can be designed to switch between superscattering and cloaking invisibility regimes, when GST is switched between its crystalline and amorphous phases. The contrast ratio between the scattering cross sections of cloaking invisibility and superscattering regimes can be as high as ∼ 93%. Our results could be potentially important for developing a new generation of compact reconfigurable optical devices.
Additional Information
© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. Received 23 Apr 2018; revised 21 May 2018; accepted 21 May 2018; published 30 May 2018. Funding: National Natural Science Foundation of China (NSFC) (61605252); Hunan Provincial Natural Science Foundation of China (2017JJ3375); National Key Research and Development Program of China (2016YFC0102401); National Science Foundation (NSF) (1254934).Attached Files
Published - ome-8-6-1672.pdf
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Additional details
- Eprint ID
- 87262
- Resolver ID
- CaltechAUTHORS:20180620-120117132
- 61605252
- National Natural Science Foundation of China
- 2017JJ3375
- Hunan Provincial Natural Science Foundation of China
- 2016YFC0102401
- National Key Research and Development Program of China
- ECCS-1254934
- NSF
- Created
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2018-06-20Created from EPrint's datestamp field
- Updated
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2021-11-15Created from EPrint's last_modified field