Abstract-Flexible inkjet-printed metamaterial absorber for coating a cylindrical object

Flexible inkjet-printed metamaterial absorber for coating a cylindrical object Hyung Ki Kim, Kenyu Ling, Kyeongseob Kim, and Sungjoon Lim  »View Author Affiliations

http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-23-5-5898

Optics Express, Vol. 23, Issue 5, pp. 5898-5906 (2015)
http://dx.doi.org/10.1364/OE.23.005898

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In this paper, a novel flexible inkjet-printed metamaterial absorber is proposed. The unit cell of the metamaterial is designed with a modified Jerusalem-cross ring resonator and is inkjet printed with silver nanoparticle ink on a flexible polymer film. All fabrication processes are performed using a commercial printer (EPSON WF-7011). The absorber’s flexibility and absorption performance are demonstrated by measuring the absorption ratio after coating the proposed absorber on a cylindrical object with a radius of 4.56 cm. An absorption rate exceeding 99% is achieved at 9.21 GHz for both flat and cylindrical surfaces. In addition, the cylindrical model attains an absorption rate higher than 96% for all polarization angles, and a high absorption rate of 95% is preserved until the incident angle is less than 30þ.

© 2015 Optical Society of America

Abstract-Microfluidic tunable inkjet-printed metamaterial absorber on paper

Microfluidic tunable inkjet-printed metamaterial absorber on paper Kenyu Ling, Minyeong Yoo, Wenjing Su, Kyeongseob Kim, Benjamin Cook, Manos M. Tentzeris, and Sungjoon Lim  »View Author Affiliations

Optics Express, Vol. 23, Issue 1, pp. 110-120 (2015)
http://dx.doi.org/10.1364/OE.23.000110

http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-23-1-110

In this paper, we propose a novel microfluidic tunable metamaterial (MM) absorber printed on a paper substrate in silver nanoparticle ink. The metamaterial is designed using a periodic array consisting of square patches. The conductive patterns are inkjet-printed on paper using silver nanoparticle inks. The microfluidic channels are laser-etched on polymethyl methacrylate (PMMA). The conductive patterns on paper and the microfluidic channels on PMMA are bonded by an SU-8 layer that is also inkjet-printed on the conductive patterns. The proposed MM absorber provides frequency-tuning capability for different fluids in the microfluidic channels. We performed full-wave simulations and measurements that confirmed that the resonant frequency decreased from 4.42 GHz to 3.97 GHz after the injection of distilled water into the microfluidic channels. For both empty and water-filled channels, the absorptivity is higher than 90% at horizontal and vertical polarizations.

© 2015 Optical Society of America