1
|
Lee IH, Yu ES, Lee SH, Lee SD. Full-coloration based on metallic nanostructures through phase discontinuity in Fabry-Perot resonators. OPTICS EXPRESS 2019; 27:33098-33110. [PMID: 31878384 DOI: 10.1364/oe.27.033098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Accepted: 10/17/2019] [Indexed: 06/10/2023]
Abstract
We demonstrate a flexible full-color plate using Fabry-Perot (FP) resonators with two different types of silver nanostructures, a uniform nanofilm and a layer of nanoislands, for transmissive color elements. Two different nanostructures with deep-subwavelength features are selectively generated according to the layer thickness during vacuum deposition with no patterning process. In the nanofilm case, the primary optical mode accountable for generating the color shifts to blue from the original FP resonance while in the nanoislands case, it shifts to red so that a wide spectrum in the visible range is available through the phase discontinuity in the FP resonators. The peaks in the FP resonance shifted toward the opposite directions are attributed to the opposite signs of the phase retardations by a nanofilm and nanoislands. This approach paves a new way of constructing full-color elements for a variety of display devices and image storage systems.
Collapse
|
2
|
Kim SJ, Jung PH, Kim W, Lee H, Hong SH. Generation of highly integrated multiple vivid colours using a three-dimensional broadband perfect absorber. Sci Rep 2019; 9:14859. [PMID: 31619698 PMCID: PMC6795891 DOI: 10.1038/s41598-019-49906-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2019] [Accepted: 08/16/2019] [Indexed: 11/09/2022] Open
Abstract
The colour printing technology based on interactions between geometric structures and light has various advantages over the pigment-based colour technology in terms of nontoxicity and ultrasmall pixel size. The asymmetric Fabry-Perot (F-P) cavity absorber is the simplest light-interacting structure, which can easily represent and control the colour by the thickness of the dielectric layer. However, for practical applications, an advanced manufacturing technique for the simultaneous generation of multiple reflective colours is required. In this study, we demonstrate F-P cavity absorbers with micropixels by overcoming the difficulties of multi-level pattern fabrication using a nanoimprinting approach. Our asymmetric F-P cavity absorber exhibited a high absorption (approximately 99%) in a wide visible light range upon the incorporation of lossy metallic materials, yielding vivid colours. A high-resolution image of eight different reflective colours was obtained by a one-step process. This demonstrates the potential of this technology for device applications such as high-resolution colour displays and colour patterns used for security functions.
Collapse
Affiliation(s)
- Soo-Jung Kim
- Department of Materials Science and Engineering, Korea University, Anam-dong 5-1, Sungbuk-Ku, Seoul, 136-701, Republic of Korea
| | - Pil-Hoon Jung
- Department of Materials Science and Engineering, Korea University, Anam-dong 5-1, Sungbuk-Ku, Seoul, 136-701, Republic of Korea
| | - Wonjoong Kim
- Department of Materials Science and Engineering, Korea University, Anam-dong 5-1, Sungbuk-Ku, Seoul, 136-701, Republic of Korea
| | - Heon Lee
- Department of Materials Science and Engineering, Korea University, Anam-dong 5-1, Sungbuk-Ku, Seoul, 136-701, Republic of Korea.
| | - Sung-Hoon Hong
- ICT Materials and Components Research Laboratory, Electronic and Telecommunications Research Institute Gajeong-dong, Yuseong-gu, Daejeon, 305-700, Republic of Korea.
| |
Collapse
|
3
|
Lee IH, Li G, Lee BY, Kim SU, Lee B, Oh SH, Lee SD. Selective photonic printing based on anisotropic Fabry-Perot resonators for dual-image holography and anti-counterfeiting. OPTICS EXPRESS 2019; 27:24512-24523. [PMID: 31510339 DOI: 10.1364/oe.27.024512] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Accepted: 07/31/2019] [Indexed: 06/10/2023]
Abstract
We present the photonic printing that can display different color images depending on the optical polarization of incident light. The dynamic selection among different images becomes possible by using anisotropic Fabry-Perot resonators that incorporate a layer of liquid crystal molecules aligned by directional molecular registration (DMR) as polarization-dependent color pixels. Using the new device platform, we demonstrate a prototype of an anticounterfeiting label with inherent anti-replicability that results from the molecular-level origin of security images. In addition, this concept is extended to polarization-selective holography. Our molecular-level approach enables to develop a new class of security labels and holographic storage media.
Collapse
|
4
|
Yu ES, Lee SH, Bae YG, Choi J, Lee D, Kim C, Lee T, Lee SY, Lee SD, Ryu YS. Highly Sensitive Color Tunablility by Scalable Nanomorphology of a Dielectric Layer in Liquid-Permeable Metal-Insulator-Metal Structure. ACS APPLIED MATERIALS & INTERFACES 2018; 10:38581-38587. [PMID: 30295452 DOI: 10.1021/acsami.8b12553] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
A liquid-permeable concept in a metal-insulator-metal (MIM) structure is proposed to achieve highly sensitive color-tuning property through the change of the effective refractive index of the dielectric insulator layer. A semicontinuous top metal film with nanoapertures, adopted as a transreflective layer for MIM resonator, allows to tailor the nanomorphology of a dielectric layer through selective etching of the underneath insulator layer, resulting in nanopillars and hollow voids in the insulator layer. By allowing outer mediums to enter into the hollow voids of the dielectric layer, such liquid-permeable MIM architecture enables to achieve the wavelength shift as large as 323.5 nm/RIU in the visible range, which is the largest wavelength shift reported so far. Our liquid-permeable approaches indeed provide dramatic color tunablility, a real-time sensing scheme, long-term durability, and reproducibility in a simple and scalable manner.
Collapse
Affiliation(s)
- Eui-Sang Yu
- Department of Electrical and Computer Engineering , Seoul National University , Seoul 08826 , Republic of Korea
- Sensor System Research Center , Korea Institute of Science and Technology , Seoul 02792 , Republic of Korea
| | - Sin-Hyung Lee
- Department of Electrical and Computer Engineering , Seoul National University , Seoul 08826 , Republic of Korea
| | - Young-Gyu Bae
- School of Electronics Engineering , Kyungpook National University , Daegu 41566 , Republic of Korea
| | - Jaebin Choi
- Sensor System Research Center , Korea Institute of Science and Technology , Seoul 02792 , Republic of Korea
| | - Donggeun Lee
- Sensor System Research Center , Korea Institute of Science and Technology , Seoul 02792 , Republic of Korea
- Department of Electrical and Electronic Engineering , Yonsei University , Seoul 03722 , Republic of Korea
| | - Chulki Kim
- Sensor System Research Center , Korea Institute of Science and Technology , Seoul 02792 , Republic of Korea
| | - Taikjin Lee
- Sensor System Research Center , Korea Institute of Science and Technology , Seoul 02792 , Republic of Korea
| | - Seung-Yeol Lee
- School of Electronics Engineering , Kyungpook National University , Daegu 41566 , Republic of Korea
| | - Sin-Doo Lee
- Department of Electrical and Computer Engineering , Seoul National University , Seoul 08826 , Republic of Korea
| | - Yong-Sang Ryu
- Sensor System Research Center , Korea Institute of Science and Technology , Seoul 02792 , Republic of Korea
| |
Collapse
|
5
|
Kim SU, Lee SH, Lee IH, Lee BY, Na JH, Lee SD. Generation of intensity-tunable structural color from helical photonic crystals for full color reflective-type display. OPTICS EXPRESS 2018; 26:13561-13572. [PMID: 29801380 DOI: 10.1364/oe.26.013561] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2018] [Accepted: 05/08/2018] [Indexed: 06/08/2023]
Abstract
A new concept of intensity-tunable structural coloration is proposed on the basis of a helical photonic crystal (HPC). The HPCs are constructed from a mixture of chiral reactive mesogens by spin-coating, followed by the photo-polymerization. A liquid crystal (LC) layer, being homogeneously aligned, is prepared on the HPCs to serve as a tunable waveplate. The electrical modulation of the phase retardation through the LC layer directly leads to the intensity-tunable Bragg reflection from the HPCs upon the incidence of the polarized light. The bandwidths of the structural colors are found to be well preserved regardless of the applied voltage. A prototype of a full color reflective-type display, incorporated with three primary color units, is demonstrated. Our concept of decoupling two mutually independent functions, the intensity modulation by the tunable waveplate and the color reflection by the HPCs provides a simple and powerful way of producing a full color reflective-type display which possesses high color purity, high optical efficiency, the cycling durability, and the design flexibility.
Collapse
|