[1] Popovic Z D, Sprague R A and Connell G A N 1988 Technique for monolithic fabrication of microlens arrays Appl. Opt. 27 1281–4
[2] Lee S K, Lee K C and Lee S S 2002 A simple method for microlens fabrication by the modified LIGA process J. Micromech. Microeng. 12 334–40
[3] Lee B K, Kim D S and Kwon T H 2004 Replication of microlens arrays by injection molding Microsyst. Technol. 10 531–5
[4] Kim J Y, Brauer N B, Fakhfouri V, Boiko D L, Charbon E, Grutzner G and Brugger J 2011 Hybrid polymer microlens arrays with high numerical apertures fabricated using simple ink-jet printing technique Opt. Mater. Express 1 259–69
[5] Vlkel R, Eisner M and Weible K J 2003 Miniaturized imaging systems Microelectron. Eng. 67–68 461–72
[6] Kuang D F, Zhang X L, Gui M and Fang Z L 2009 Hexagonal microlens array fabricated by direct laser writing and inductively coupled plasma etching on organic light emitting devices to enhance the outcoupling efficiency Appl. Opt. 48 974–8
[7] Yang R, Wang W J and Soper S A 2005 Out-of-plane microlens array fabricated using ultraviolet lithography Appl. Phys. Lett. 86 161110
[8] Hoy C L, Durr N J, Chen P Y, Piyawattanametha W, Ra H, Solgaard O and Ben-Yakar A 2008 Opt. Express 16 9996–10005
[9] Biehl S, Danzebrink R, Oliveira P and Aegerter M A 1998 Refractive microlens fabrication by ink-jet process J. Sol-Gel Sci. Technol. 13 177–82
[10] Brückner A, Oberdrster A, Dunkel J, Reimann A, Müller M and Wippermann F 2014 Ultra-thin wafer-level camera with 720p resolution using micro-optics Proc. SPIE 9193 Novel Optical Systems Design and Optimization XVII 91930W (San Diego, California, United States: SPIE)
[11] Zappe H P 2010 Fundamentals of Micro-optics (Cambridge: Cambridge University Press)
[12] Malinauskas M, Gilbergs H, ukauskas A, Purlys V, Paipulas D and Gadonas R 2010 A femtosecond laser-induced two-photon photopolymerization technique for structuring microlenses J. Opt. 12 035204
[13] Malinauskas M et al 2010 Femtosecond laser polymerization of hybrid/integrated micro-optical elements and their characterization J. Opt. 12 124010
[14] Williams H E, Freppon D J, Kuebler S M, Rumpf R C and Melino M A 2011 Fabrication of three-dimensional micro-photonic structures on the tip of optical fibers using SU-8 Opt. Express 19 22910–22
[15] Malinauskas M, Farsari M, Piskarskas A and Juodkazis S 2013 Ultrafast laser nanostructuring of photopolymers: a decade of advances Phys. Rep. 533 1–31
[16] Gissibl T, Schmid M and Giessen H 2016 Spatial beam intensity shaping using phase masks on single-mode optical fibers fabricated by femtosecond direct laser writing Optica 3 448–51
[17] Gissibl T, Thiele S, Herkommer A and Giessen H 2016 Sub-micrometre accurate free-form optics by three-dimensional printing on single-mode fibres Nat. Commun. 7 11763
[18] Coquoz O, Conde R, Taleblou F and Depeursinge C 1995 Performances of endoscopic holography with a multicore optical fiber Appl. Opt. 34 7186–93
[19] Gissibl T, Thiele S, Herkommer A and Giessen H 2016 Two-photon direct laser writing of ultracompact multi-lens objectives Nat. Photonics 10 554–60
[20] Li J W et al 2018 Two-photon polymerisation 3D printed freeform micro-optics for optical coherence tomography fibre probes Sci. Rep. 8 14789
[21] Tan J Y, Yu R W and Xiao L M 2019 Bessel-like beams generated via fiber-based polymer microtips Opt. Lett. 44 1007–10
[22] Liu Y, Stein O, Campbell J H, Jiang L J, Petta N and Lu Y F 2017 Three-dimensional printing and deformation behavior of low-density target structures by two-photon polymerization Proc. SPIE 10354 Nanoengineering: Fabrication, Properties, Optics, and Devices XIV 103541U (San Diego, CA: SPIE)
[23] Liu Y, Campbell J H, Stein O, Jiang L J, Hund J and Lu Y F 2018 Deformation behavior of foam laser targets fabricated by two-photon polymerization Nanomaterials 8 498
[24] Sample development (available at https://support. nanoscribe.com/hc/en-gb/articles/360001344673)
[25] Radke A, Gissibl T, Klotzbücher T, Braun P V and Giessen H 2011 Three-dimensional bichiral plasmonic crystals fabricated by direct laser writing and electroless silver plating Adv. Mater. 23 3018–21
[26] Phillips D B, Padgett M J, Hanna S, Ho Y L D, Carberry D M, Miles M J and Simpson S H 2014 Shape-induced force fields in optical trapping Nat. Photonics 8 400–5
[27] Removal and stripping (available at: https://support. nanoscribe.com/hc/en-gb/articles/360002773914)
[28] Curing printed structures (available at: https://support. nanoscribe.com/hc/en-gb/articles/360002022373)
[29] Dottermusch S, Busko D, Langenhorst M, Paetzold U W and Richards B S 2019 Exposure-dependent refractive index of nanoscribe IP-Dip photoresist layers Opt. Lett. 44 29–32