Zong-Han Yang

National Yang Ming Chiao Tung University

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Fan‐Ching Chien

National Central University

Wei Lee

Crystal Research (United States)

Peilin Chen

Tangshan Gongren Hospital

Yu‐Cheng Hsiao

Taipei Medical University

Kuo‐Ping Chen

National Tsing Hua University

Chiung‐Wen Kuo

Research Center for Applied Science, Academia Sinica

Di-Yan Chueh

Research Center for Applied Science, Academia Sinica

Yi‐Chung Tung

Research Center for Applied Science, Academia Sinica

Yu‐Sheng Hsiao

National Yang Ming Chiao Tung University

Pulickel M. Ajayan

Rice University

Cooperative Institutions

Academia Sinica

National Yang Ming Chiao Tung University

Research Center for Applied Science, Academia Sinica

National Taiwan University

National Taiwan University Hospital

Nanyang Technological University

National Cheng Kung University

Tainan University of Technology

Rice University

Ministry of Education of the People's Republic of China

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Electrically tunable transmission of gold binary-grating metasurfaces integrated with liquid crystals

Optics Express (2016)

Kuo‐Ping Chen Shi-Cheng Ye Chi-Yin Yang Zong-Han Yang Wei Lee

Planar photonics using metasurfaces is of great interest because a metasurface can control the flow of light beyond that attainable with natural materials. The resonance wavelength of a binary-grating metasurface is adjustable by changing the width and thickness of the nanostructure. We propose a novel combination of nematic liquid crystals and a binary-grating metasurface with which the diffraction efficiency can be controlled by adjusting the applied voltage.

Diffraction efficiency

Guided-mode resonance

10.1364/oe.24.016815

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Citations (24)

Investigation of the growth of focal adhesions using protein nanoarrays fabricated by nanocontact printing using size tunable polymeric nanopillars

Nanotechnology (2011)

Chiung Wen Kuo Fan‐Ching Chien Jau‐Ye Shiu Shih-Min Tsai Di-Yan Chueh

Here we describe a simple approach to create various sizes of protein nanoarrays for the investigation of cell adhesion. Using a combination of nanosphere lithography, oxygen plasma treatment, deep etching and nanomolding processes, well-ordered polymeric nanopillar arrays have been fabricated with diameters in the range of 50–600 nm. These nanopillar arrays were used as stamps for nanocontact printing to create fibronectin nanoarrays, which were used to study the size dependent formation of focal adhesion. It was found that cells can adhere and spread on fibronectin nanoarrays with a fibronectin pattern as small as 50 nm. It was also found that the average size of focal adhesion decreased as the size of the fibronectin pattern was reduced.

Nanopillar

Soft Lithography

10.1088/0957-4484/22/26/265302

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Citations (12)

Hybrid contact and interfacial adhesion on well-defined periodic hierarchical pillars

Nanoscale (2012)

Zong-Han Yang Fan‐Ching Chien Chiung‐Wen Kuo Di-Yen Chueh Peilin Chen

Herein, we describe a simple fabrication procedure for creating artificial hierarchical micro/nanopillars on silicon substrates that allows an effective, precise control of the interfacial adhesion and surface hydrophobicity. These well-defined hierarchical micro/nanostructures have four possible wetting states: Cassie–Cassie (C–C), Cassie–Wenzel (C–W), Wenzel–Cassie (W–C) and Wenzel–Wenzel (W–W). By controlling the critical height of the micro/nanopillars, it is possible to fabricate hierarchical micro/nanostructures in these four states. Thus, the hierarchical superhydrophobic surfaces proposed and fabricated in this study are promising for mimicking either lotus leaves with low adhesion or rose petals with high adhesion.

Nanopillar

Lotus effect

10.1039/c2nr31946b

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Citations (14)

A thermally tunable narrowband selector based on a chiral nematic containing a binary thermosensitive chiral dopant mixture

Molecular Crystals and Liquid Crystals (2017)

Zong-Han Yang Yu‐Cheng Hsiao Dong Shen Wei Lee

We employed a thermosensitive chiral dopant (CD), characterized by its thermoinduced change in helical twisting power (HTP) in terms of the handedness and strength, to shift the Bragg reflection band of a CLC. A thermally tunable photonic bandgap (PBG) device was demonstrated using a one-dimensional asymmetric photonic crystal (PC) infiltrated with the CLC as a defect layer. With a temperature controller to shift the PBG of the CLC, two narrow transmission bands can be tuned in the spectrum dominated by the asymmetric PC structure. This optical device can find applications as a tunable narrowband wavelength selector or an intensity controller.

Narrowband

10.1080/15421406.2016.1277321

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Citations (4)

Electrically active nanoantenna array enabled by varying the molecular orientation of an interfaced liquid crystal

RSC Advances (2016)

Yu‐Cheng Hsiao Chen-Wei Su Zong-Han Yang Yevheniia I. Cheypesh Jhen‐Hong Yang

An electro-optical cell comprising a gold nanoantenna array covered with high-birefringence liquid crystal permits tunability in wavelength of surface plasmonic resonance up to 90 nm.

10.1039/c6ra11428h

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Citations (11)

Interfacial adhesion and superhydrophobicity modulated with polymeric nanopillars using integrated nanolithography

Journal of Micromechanics and Microengineering (2012)

Zong-Han Yang Fan‐Ching Chien Chiung‐Wen Kuo Di-Yan Chueh Yi‐Chung Tung

This paper reports the successful fabrication of flexible replicas with polymeric nanopillars using a process that combines nanosphere lithography, dry deep etching, soft-lithography, nanomolding and hydrophobic modification. The polymeric nanopillars with various sizes and three different periodicities have been implemented for systematic investigations on the interfacial properties on those surfaces. Such a flexible polymeric surface exhibited the maximum static contact angle of 166.8° at the nanopillars with a diameter of 60 nm, height of 710 nm and periodicity of 300 nm. The optimum aspect ratio should be less than 7 to avoid defects and collapses among those polymeric nanopillars during nanomolding. Metastable contact at the transition state indeed occurred on the parts of the intrinsic nanopillars, the experimental results of which also matched well to the classical theory of critical contact angle. Using hydrophobic modifications, metastable contacts among those polymeric nanopillars have further been eliminated. The polymeric nanopillars reported here were verified as having very strong adhesion as well as superhydrophobicity because such nanopillars made microdroplets hang firmly on the vertical surfaces of those designed replicas.

Nanopillar

10.1088/0960-1317/22/12/125026

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Citations (2)

A super dark material: randomness and porosity in a nanostructure

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE (2007)

Zong-Han Yang S. Y. Lin James A. Bur Lijie Ci Pulickel M. Ajayan

In this paper, we report the realization of a low-density vertically aligned carbon nanotube (VA-CNT) array and show that it can have an ultra-low total reflectance due to its nanoscale surface roughness and low index of refraction as recently predicted by theories. Our VA-CNT arrays have a total reflectance R=0.1%, which is 60%-80% lower than the previously reported lowest value, making it the best candidate for an ideal, all-angle, all-wavelength optical absorber.

Realization (probability)

10.1117/12.732441

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