Zhan-Hong Lin


Last Name

Lin

First Name

Zhan-Hong

ORCID

0000-0002-6158-6450

Organisational unit

09502 - Shih, Chih-Jen / Shih, Chih-Jen

Filters

2024 - 20253
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Publications 1 - 3 of 3
  • Direct nanopatterning of complex 3D surfaces and self-aligned superlattices via molecular-beam holographic lithography
    Item type: Journal Article
    Zeng, Shuangshuang; Tian, Tian; Oh, Jiwoo; et al. (2025)
    Nature Communications
    Conventional lithography methods involving pattern transfer through resist templating face challenges of material compatibility with various process solvents. Other approaches of direct material writing often compromise pattern complexity and overlay accuracy. Here we explore a concept based on the Moir & eacute; interference of molecular beams to directly pattern complex three-dimensional (3D) surfaces made by any evaporable materials, such as metals, oxides and organic semiconductors. Our proposed approach, termed the molecular-beam holographic lithography (MBHL), relies on precise control over angular projections of material flux passing through nanoapertures superimposed on the substrate, emulating the interference of coherent laser beams in interference lithography. Incorporating with our computational lithography (CL) algorithm, we have demonstrated self-aligned overlay of multiple material patterns to yield binary up to quinary superlattices, with a critical dimension and overlay accuracy on the order of 50 and 2 nm, respectively. The process is expected to substantially expand the boundary of materials combination for high-throughput fabrication of complex superstructures of translational symmetry on arbitrary substrates, enabling emerging nanoimaging, sensing, catalysis, and optoelectronic devices.
  • Metasurfaces for chiroptical sensing
    Item type: Journal Article
    Lin, Zhan-Hong; Huang, Jer-Shing (2024)
    Semiconductors and Semimetals
    Using nanostructures and metasurfaces to enhance chiroptical sensing has recently attracted research attention due to its possibility to achieve ultrahigh sensitivity for biomedical sensing, material characterization, and pharmaceutical analysis. This chapter introduces the current advances in the study of plasmonic and dielectric metasurfaces for enhancing chiral light-matter interaction. Three key issues are specifically discussed, namely the background noise, the bandwidth, and the spatially localized optical near-fields. Various chiral metasurfaces have been demonstrated to enhance circular dichroism. However, the use of chiral structures leads to unwanted background noise. We discuss the pros and cons of different metasurface-enhanced chiroptical sensing scenarios by considering the chirality of the light and nanostructures. As for the bandwidth issue, since most designs are based on resonance, the operational bandwidth is naturally limited, rendering the spectroscopic applications difficult. We discuss this limitation and show possible solutions. The third major issue is that the desired optical field is only accessible in a limited area around the hotspots. This limits the enhancement and performance in practical applications. We discuss the strategy of using enantioselective optical trapping to bring the chiral targets to the hotspots for chiroptical sensing. These issues are particularly important at ultra-low sample concentrations. Selected examples on circular dichroism analysis using linearly polarized light are discussed in detail, including 3D Archimedean spiral metasurface for broadband chiroptical sensing, dielectric metasurface for circular dichroism detection at ultra-low concentration by evanescent-wave cavity ring-down spectroscopy, and elliptical nanoholes for enantioselective optical trapping. The challenges and prospects for chiroptical sensing using metasurfaces are summarized at the end of this chapter.
  • Scalable nanopatterning of organic light-emitting diodes beyond the diffraction limit
    Item type: Journal Article
    Marcato, Tommaso; Oh, Jiwoo; Lin, Zhan-Hong; et al. (2025)
    Nature Photonics
    Miniaturization of light-emitting diodes below the diffraction limit of the emission wavelength can enable super-resolution imaging and on-chip light sources for ultrabroadband chiplet communication. Organic light-emitting diodes, although suitable for miniaturization due to their emission from localized excitons, suffer from the limited compatibility of organic materials with traditional photolithographic patterning. Here we develop a method for the scalable fabrication of nanoscale organic light-emitting diodes with pixel densities up to 100,000 pixels per inch, periodicity of 250 nm and the smallest pixel size in the order of 100 nm. We realize the direct nanoscale patterning of organic semiconductors by self-aligned nanostencil etching and lithography. The process is resist-free and involves etching and evaporation through nanoapertures in a free-standing film adhering to the substrate. A nanoscale organic light-emitting diode surface with over 1 megapixel exhibits an average external quantum efficiency of 13.1%. We also demonstrate electroluminescent metasurfaces with subwavelength-scale meta-atoms that can electrically modulate the emitted light. The diffractive coupling between nanopixels enables control over the far-field emission properties of light, including directionality and polarization. These results pave the way for hybrid integrated photonics technologies, including visible-light communication, lasing and high-resolution displays.
Publications 1 - 3 of 3