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이다솔(Dasol Lee),노준석(Junsuk Rho) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
A broadband tunable absorber is designed and fabricated. The tunable absorber is comprised of a dielectric-metaldielectric multilayer and plasmonic grating. A large size of tunable absorber device is fabricated by nano-imprinting method. The experimental results show that over 90% absorption can be achieved within visible and near-infrared regimes. Moreover, the high absorption can be controlled by changing the polarization of incident light. This polarization-sensitive tunable absorber has practical applications such as high-efficiency polarization detectors and transmissive polarizer.
윤관호(Gwanho Yoon),이다솔(Dasol Lee),노준석(Junsuk Rho) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Dual-mode metasurfaces enabling simultaneous control of phase and spectral responses have been demonstrated. Conventional metasurfaces have shown many promising functionalities such as super-lensing, negative refraction and optical cloaking, but their operation is restricted by spatial coherence of light sources. In this work, we have exploited typical geometric metasurfaces to manipulate phase responses while reflection spectrum is also controlled by specific shape of each nanostructure. Two functionalities can be independently controlled, so the dual-mode metasurface can work as not only a hologram under coherent light, but also a colored reflective display under white light illumination.
메타표면 기반 평면 광학 부품: 홀로그램, 완전흡수체 및 소용돌이 빔 생성 메타렌즈
김인기(Inki Kim),정헌영(Heonyeong Jeong),노준석(Junsuk Rho) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12
Metasurfaces, two dimensional (2D) metamaterials comprised of subwavelength features, can be used to tailor the amplitude, phase and polarization of an incident electromagnetic wave propagating at an interface. The planar and surface-based optical components enabled by metasurfaces are believed to be a promising technology to replace or supplement existing bulk optical components. In this work, we demonstrate three distinctive flat optical components, which are meta-hologram, perfect absorber and vortex beam generating metasurfaces. From the point of practical use of the metasurfaces, we develop functionalized flat optical components. In detail, our meta-hologram can generate vivid holographic images under unpolarized natural light (e.g. sunlight, flash light of cellphone). For the case of perfect absorber composed of chromium ring-shaped structures, they can absorber over 96% visible light with high heat resistance, which can endure 600˚C temperature. Finally, we propose polarization-insensitive multifunctional metasurfaces for generating highly focused optical vortex beam at a desired focal point.