@misc{13338,
  abstract     = {{This work discusses the additive manufacturing of an axicon lens using cyclic olefin copolymer (TOPAS), and its characterization between 100 GHz and 300 GHz. The proposed manufacturing process followed by dip-coating post-processing provides an improved surface finish. Additionally, the terahertz output of the lens remains intact over the entire frequency range.}},
  author       = {{Shrotri, Abhijeet Narendra and Joshi, Suraj and Vogel, Lea and Starsaja, Annamarija and Stübbe, Oliver and Preu, Sascha}},
  booktitle    = {{2025 50th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)}},
  keywords     = {{Manufacturing processes, Surface waves, Three-dimensional printing, Surface finishing, Surface treatment, Lenses}},
  location     = {{ Helsinki, Finland }},
  pages        = {{2}},
  publisher    = {{IEEE}},
  title        = {{{Terahertz Axicon Lenses}}},
  doi          = {{10.1109/irmmw-thz61557.2025.11319870}},
  year         = {{2026}},
}

@misc{13339,
  abstract     = {{Additive manufacturing (AM) paves the way for low-cost production of optical and terahertz (THz) components such as waveguides, fibers, and lenses [1]–[3]. This work addresses the fabrication and THz characterization of a 3D-printed waveguide composed of cyclic olefin copolymer (TOPAS). Such a waveguide is a convenient and inexpensive tool in the development of THz interconnects, and in applications such as biomedical sensing.}},
  author       = {{Joshi, Suraj and Starsaja, Annamarija and Shrotri, Abhijeet Narendra and Stübbe, Oliver and Preu, Sascha}},
  booktitle    = {{2025 50th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)}},
  keywords     = {{Optical fibers, Optical fiber sensors, Optical interconnections, Biomedical optical imaging, Optical device fabrication, Production, Optical waveguide components, Three-dimensional printing, Optical waveguides, Lenses}},
  location     = {{Helsinki, Finland }},
  publisher    = {{IEEE}},
  title        = {{{Additively-Manufactured Terahertz Waveguides}}},
  doi          = {{10.1109/irmmw-thz61557.2025.11320095}},
  year         = {{2026}},
}

@misc{11977,
  abstract     = {{Additive manufacturing of lenses offers quick prototyping and characterization. This paper explains the additive manufacturing and characterization of axicon lenses using TOPAS material for Terahertz sensing applications. The beam patterns of additively manufactured axicon lens prototypes are characterized around 0.3 THz with silicon-based THz-camera to evaluate the depth of focus.}},
  author       = {{Shrotri, Abhijeet Narendra and Krause, Benedikt and Stübbe, Oliver and Pfeiffer, Ullrich and Preu, Sascha}},
  booktitle    = {{2024 49th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)}},
  issn         = {{2162-2035}},
  keywords     = {{Additives, Prototypes, Three-dimensional printing, Sensors, Lenses}},
  location     = {{Perth, Australia }},
  publisher    = {{IEEE}},
  title        = {{{Evaluation of Additively Manufactured Axicon Lenses Using a THz-Camera}}},
  doi          = {{10.1109/irmmw-thz60956.2024.10697740}},
  volume       = {{2024}},
  year         = {{2024}},
}

@misc{7670,
  abstract     = {{Additive manufacturing (AM) and rapid prototyping process (RPP) have revolutionized the production of 3D objects in the last few decades. RPP has considerably increased the rate of production and the possibility of manufacturing prototypes in the fields of electrical, optical, and mechanical engineering. The manufacturing of optical prototypes including spherical, aspheric, and special kinds of lenses and lens arrays has reformed the fabrication of optical components. In this paper, specifically designed lens array prototypes for application in visible light communication (VLC) are introduced. These lens array prototypes are manufactured using the stereolithography apparatus (SLA) process. These lens arrays are designed to achieve optimal transmission of the light beam for VLC systems. One of the prototypes from the lens arrays contains primarily four spherical lenses and one thicker convex lens and the other contains one fresnel lens as a substitute for thicker convex lens. These lens arrays are further post-processed to achieve the required transparency. These lens array prototypes are tested using laser and LEDs. The ON-OFF keying modulated light beam was transmitted through the lens array at the sender side and focused on the photo-receiver using another lens array at the receiver side which is 200 cm apart. After evaluating these lens prototypes, it can be concluded that with appropriate post-processing and high-resolution stereolithography based manufacturing, a low data rate VLC link can be formed.}},
  author       = {{Shrotri, Abhijeet Narendra and Beyer, Micha and Schneider, Daniel Johann and Stübbe, Oliver}},
  booktitle    = {{Laser 3D Manufacturing VIII}},
  editor       = {{Helvajian, Henry and Gu, Bo and Chen, Hongqiang}},
  isbn         = {{978-1-5106-4189-1}},
  issn         = {{1996-756X}},
  keywords     = {{Additive manufacturing, 3D printing, Stereolithography apparatus, Spherical lenses, Fresnel lenses, Visible light communication}},
  location     = {{San Francisco }},
  publisher    = {{Society of Photo-Optical Instrumentation Engineers}},
  title        = {{{Manufacturing of lens array prototypes containing spherical and fresnel lenses for visible light communications using stereolithography apparatus}}},
  doi          = {{10.1117/12.2586907}},
  volume       = {{11677}},
  year         = {{2021}},
}

@misc{7676,
  author       = {{Shrotri, Abhijeet Narendra and Beyer, Micha and Stübbe, Oliver}},
  booktitle    = {{3D Printed Optics and Additive Photonic Manufacturing II : 6-10 April 2020, online only, France }},
  editor       = {{von Freymann, Georg and Herkommer, Alois M. and Flury, Manuel}},
  isbn         = {{978-1-5106-3470-1}},
  issn         = {{1996-756X}},
  keywords     = {{Fresnel lenses, Stereolithography apparatus, 3D printing, Photo-polymerization}},
  location     = {{Strasbourg (online)}},
  publisher    = {{SPIE}},
  title        = {{{Manufacturing and analyzing of cost-efficient fresnel lenses using stereolithography}}},
  doi          = {{10.1117/12.2555367}},
  volume       = {{11349}},
  year         = {{2020}},
}

@misc{7679,
  author       = {{Shrotri, Abhijeet Narendra and Beyer, Micha and Stübbe, Oliver}},
  booktitle    = {{	 Production engineering and management : proceedings 9th international conference, October 03 and 04, 2019, Trieste, Italy}},
  editor       = {{Padoano, Elio and Villmer, Franz-Josef}},
  isbn         = {{978-3-946856-04-7}},
  keywords     = {{3D printing, stereolithography, optical lens, light forming structures, convex lenses, concave lenses, refraction of light, focal length}},
  location     = {{Trieste}},
  pages        = {{227--240}},
  publisher    = {{Technische Hochschule Ostwestfalen-Lippe}},
  title        = {{{Evaluation of stereolithograghy processes for the production of lens prototypes}}},
  volume       = {{2019, 01}},
  year         = {{2019}},
}