• Photonics Research
  • Vol. 10, Issue 2, 303 (2022)
He Cheng1, Pooria Golvari2, Chun Xia1、2, Mingman Sun3, Meng Zhang3, Stephen M. Kuebler1、2、4, and Xiaoming Yu1、*
Author Affiliations
  • 1CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816, USA
  • 2Department of Chemistry, University of Central Florida, Orlando, Florida 32816, USA
  • 3Department of Industrial and Manufacturing Systems Engineering, Kansas State University, Manhattan, Kansas 66506, USA
  • 4Department of Material Science and Engineering, University of Central Florida, Orlando, Florida 32816, USA
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    DOI: 10.1364/PRJ.439592 Cite this Article
    He Cheng, Pooria Golvari, Chun Xia, Mingman Sun, Meng Zhang, Stephen M. Kuebler, Xiaoming Yu. High-throughput microfabrication of axially tunable helices[J]. Photonics Research, 2022, 10(2): 303 Copy Citation Text show less

    Abstract

    Helical structures exhibit novel optical and mechanical properties and are commonly used in different fields such as metamaterials and microfluidics. A few methods exist for fabricating helical microstructures, but none of them has the throughput or flexibility required for patterning a large surface area with tunable pitch. In this paper, we report a method for fabricating helical structures with adjustable forms over large areas based on multiphoton polymerization (MPP) using single-exposure, three dimensionally structured, self-accelerating, axially tunable light fields. The light fields are generated as a superposition of high-order Bessel modes and have a closed-form expression relating the design of the phase mask to the rotation rate of the beam. The method is used to fabricate helices with different pitches and handedness in the material SU-8. Compared to point-by-point scanning, the method reported here can be used to reduce fabrication time by two orders of magnitude, paving the way for adopting MPP in many industrial applications.

    1. INTRODUCTION

    In the last two decades, chiral metamaterials with helical structures have attracted significant attention because they exhibit novel optical properties, such as circular dichroism [1], optical activity [2], and negative refractive index [3,4]. Helical structures have many applications including broadband circular polarizers [2,5], circular polarization conversion [6], wave plates [7], and broadband polarization-insensitive absorbers [8]. Helical structures can also be found in microfluidic mixers [9,10], heat diffusors [11,12], and scaffolds for growing cells [13].

    Copy Citation Text
    He Cheng, Pooria Golvari, Chun Xia, Mingman Sun, Meng Zhang, Stephen M. Kuebler, Xiaoming Yu. High-throughput microfabrication of axially tunable helices[J]. Photonics Research, 2022, 10(2): 303
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