Artificial Compound Eyes Prepared by a Combination of Air-Assisted Deformation, Modified Laser Swelling, and Controlled Crystal Growth.

This study presents the manufacturing process of bioinspired compound (BIC) eyes. The hierarchical eyes were accomplished by a combination of (i) modified laser swelling, (ii) air-assisted deformation, and (iii) controlled crystal growth. The results show that the addition of nanostructures on the surface effectively improved the water repellent performance with a contact angle (CA) of ∼160° and generally decreased the reflection by ∼25% in the wavelength range of 400-800 nm than the planar surface. Apart from these properties, the BIC eyes showed good optical performance. The convex structure has a circular shape and aspherical profile; this provides optical uniformity and constant resolution (full width at half-maximum = 1.9 μm) in all the directions. Furthermore, the BIC eyes reduced the imaging distortion by 1.5/3.4 and 2.3/3.1 times along the x and y axes, respectively, under 10° and 20° incident lights than a single lens. In the light acceptance range, the image displays almost no distortion.

[1]  Lei Wang,et al.  Excellent Anti‐Icing Abilities of Optimal Micropillar Arrays with Nanohairs , 2015 .

[2]  L. Chi,et al.  Self-Assembled Monolayer Islands Masked Chemical Etching for Broad-Band Antireflective Silicon Surfaces , 2010 .

[3]  Lei Jiang,et al.  The Dry‐Style Antifogging Properties of Mosquito Compound Eyes and Artificial Analogues Prepared by Soft Lithography , 2007 .

[4]  L. Chi,et al.  Biomimetic antireflective hierarchical arrays. , 2011, Langmuir : the ACS journal of surfaces and colloids.

[5]  Qing Yang,et al.  Direct fabrication of compound-eye microlens array on curved surfaces by a facile femtosecond laser enhanced wet etching process , 2016 .

[6]  C. Pan,et al.  Improved broadband and quasi-omnidirectional anti-reflection properties with biomimetic silicon nanostructures. , 2007, Nature nanotechnology.

[7]  Longjian Xue,et al.  Porous Polymer Films with Gradient‐Refractive‐Index Structure for Broadband and Omnidirectional Antireflection Coatings , 2010 .

[8]  J. Niven,et al.  Differential scaling within an insect compound eye , 2016, Biology Letters.

[9]  T. Salamon,et al.  Nanonails: a simple geometrical approach to electrically tunable superlyophobic surfaces. , 2008, Langmuir : the ACS journal of surfaces and colloids.

[10]  Abraham Marmur,et al.  Wetting on Hydrophobic Rough Surfaces: To Be Heterogeneous or Not To Be? , 2003 .

[11]  Qing Yang,et al.  Dragonfly‐Eye‐Inspired Artificial Compound Eyes with Sophisticated Imaging , 2016 .

[12]  Letícia F. Mendes,et al.  Investigation of roughness and specular quality of commercial aluminum (6061 alloy) for fabrication of nanoporous anodic alumina films , 2017 .

[13]  Xuesong Mei,et al.  Generation of fully-covering hierarchical micro-/nano- structures by nanoimprinting and modified laser swelling. , 2014, Small.

[14]  Lin Li,et al.  Growth of hierarchical based ZnO micro/nanostructured films and their tunable wettability behavior , 2011 .

[15]  Bharat Bhushan,et al.  Wetting, adhesion and friction of superhydrophobic and hydrophilic leaves and fabricated micro/nanopatterned surfaces , 2008 .

[16]  Stephan Herminghaus,et al.  Roughness-induced non-wetting , 2000 .

[17]  J. Myoung,et al.  Biomimetic hierarchical ZnO structure with superhydrophobic and antireflective properties. , 2010, Journal of colloid and interface science.

[18]  A. Cassie,et al.  Wettability of porous surfaces , 1944 .

[19]  D. Quéré.  Wetting and Roughness , 2008 .

[20]  Qing Yang,et al.  Rapid fabrication of large-area concave microlens arrays on PDMS by a femtosecond laser. , 2013, ACS applied materials & interfaces.

[21]  Xianming Hou,et al.  Fabrication of ZnO submicrorod films with water repellency by surface etching and hydrophobic modification , 2011 .

[22]  Bharat Bhushan,et al.  Micro-, nano- and hierarchical structures for superhydrophobicity, self-cleaning and low adhesion , 2009, Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences.

[23]  Hongrui Jiang,et al.  Artificial eye for scotopic vision with bioinspired all-optical photosensitivity enhancer , 2016, Proceedings of the National Academy of Sciences.

[24]  Bharat Bhushan,et al.  Mechanically durable carbon nanotube-composite hierarchical structures with superhydrophobicity, self-cleaning, and low-drag. , 2009, ACS nano.

[25]  T. Chen,et al.  Tunable wettability in surface-modified ZnO-based hierarchical nanostructures , 2008 .

[26]  Neelesh A Patankar,et al.  Mimicking the lotus effect: influence of double roughness structures and slender pillars. , 2004, Langmuir : the ACS journal of surfaces and colloids.

[27]  Man Zhang,et al.  Structural design and image processing of a spherical artificial compound eye , 2015 .

[28]  Jianliang Xiao,et al.  Mechanics and optics of stretchable elastomeric microlens array for artificial compound eye camera , 2015 .

[29]  Yicheng Lu,et al.  Integrated ZnO nanotips on GaN light emitting diodes for enhanced emission efficiency , 2007 .

[30]  Luke P. Lee,et al.  Bioinspired Fabrication of High‐Quality 3D Artificial Compound Eyes by Voxel‐Modulation Femtosecond Laser Writing for Distortion‐Free Wide‐Field‐of‐View Imaging , 2014 .

[31]  Hong-Bo Sun,et al.  High numerical aperture microlens arrays of close packing , 2010 .

[32]  Jr-Hau He,et al.  Light scattering by nanostructured anti-reflection coatings , 2011 .

[33]  H. Yu,et al.  Fabrication and characterization of artificial miniaturized insect compound eyes for imaging. , 2015, Bioinspiration & biomimetics.

[34]  John A Rogers,et al.  Large-field-of-view wide-spectrum artificial reflecting superposition compound eyes. , 2014, Small.

[35]  Edward Bormashenko,et al.  The rigorous derivation of Young, Cassie–Baxter and Wenzel equations and the analysis of the contact angle hysteresis phenomenon , 2008 .

[36]  Willem L. Vos,et al.  Broad‐band and Omnidirectional Antireflection Coatings Based on Semiconductor Nanorods , 2009 .

[37]  Qing Yang,et al.  Photoetching of spherical microlenses on glasses using a femtosecond laser , 2009, Optics Communications.

[38]  Rene Lopez,et al.  Biomimetic microlens array with antireflective “moth-eye” surface , 2011 .

[39]  Dianpeng Qi,et al.  Fabrication of antireflective compound eyes by imprinting. , 2013, ACS applied materials & interfaces.

[40]  Qidai Chen,et al.  Protein-based soft micro-optics fabricated by femtosecond laser direct writing , 2014, Light: Science & Applications.

[41]  J. Si,et al.  Controllable adhesive superhydrophobic surfaces based on PDMS microwell arrays. , 2013, Langmuir : the ACS journal of surfaces and colloids.

[42]  Luke P. Lee,et al.  Biologically Inspired Artificial Compound Eyes , 2006, Science.

[43]  J. Myoung,et al.  Tunable and reversible surface wettability transition of vertically aligned ZnO nanorod arrays , 2009 .

[44]  Qing Yang,et al.  Simple fabrication of closed-packed IR microlens arrays on silicon by femtosecond laser wet etching , 2015 .