Novel Fabrication and Characterization of Diaphragm Micromirror Using ‘Bulk Lithography’

2012 ◽  
Author(s):  
Prasanna Gandhi ◽  
Shital Kamble ◽  
Kiran Bhole
Keyword(s):  
Adaptive Optics ◽  
Focal Length ◽  
Laser Doppler Vibrometer ◽  
Single Layer ◽  
Layer By Layer ◽  
Micro Fabrication ◽  
Wavefront Correction ◽  
Fabrication And Characterization ◽  
First Time

Adaptive optics is being explored actively for several applications such as wavefront correction in biomedical imaging (retinal surgery), variable focal length lenses, and adaptive zoom micromirrors. Diaphragm micromirrors have several advantages such as continuity in image and ease of fabrication. This paper investigates, for the first time to the best of our knowledge, fabrication of diaphragm micromirror using a recently proposed novel process of ‘Bulk Lithography’. In contrast to classical microstereolithography (MSL) processes of 3D layer-by-layer micro fabrication, bulk lithography fabrication is done by scanning of laser beam over the photopolymer resin of unconstraint depth in a single layer scan. The process has capability to fabricate smoothly varying thickness diaphragms for micromirrors. However, as a first step, this paper demonstrates fabrication of uniform thickness micromirrors coated with aluminum. Micromirrors are fabricated with air trapped beneath them which contributes to enhanced stiffness and low damping. Further fabricated micromirror is characterized using laser doppler vibrometer.

Fabrication and Characterization of MEMS Deformable Mirrors for Adaptive Optics

2006 ◽  
Author(s):  
Hyunkyu Park ◽  
David Horsley
Keyword(s):  
Adaptive Optics ◽  
Laser Doppler Vibrometer ◽  
Surface Shape ◽  
Analytical Models ◽  
Deformable Mirror ◽  
Experimental Measurements ◽  
Vision Science ◽  
Step Voltage ◽  
Fabrication And Characterization

A bimorph deformable mirror (DM) for use in ophthalmologic adaptive optics is presented. The fabrication process and the results of characterization of the DM are described. Interferometric measurements of the DM surface shape and voltage-to-displacement characteristics are shown. The response of the DM to a step voltage input is measured using a commercial laser Doppler vibrometer (LDV). Experimental measurements of the DM are compared with both finite-element and analytical models. Analysis of the experimental measurements compared to the theoretical model will be used to design and fabricate an optimized DM for vision science.

Nonvolatile resistive memories utilizing functional PES-based supramolecular film

2017 ◽  
Vol 30 (9) ◽  
pp. 1056-1063 ◽  
Author(s):  
Hejing Sun ◽  
Haibo Zhang ◽  
Zheng Chen ◽  
Jinhui Pang ◽  
Cong Gao ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
High Performance ◽  
Memory Device ◽  
Memory Devices ◽  
Resistive Switching Memory ◽  
Threshold Voltages ◽  
High Performance Polymer ◽  
Fabrication And Characterization ◽  
First Time

This study reports the fabrication and characterization of polymer resistive switching memory devices fabricated from poly(ether sulfone)s (PESs), containing carboxylic functional groups for hydrogen bonding with disperse red 1. PES-based supramolecular memory devices exhibited write-once read-many-times-type memory effects, with low switching threshold voltages below −5.0 V and high ON/OFF current ratios of 105. It is the first time that the concept of azobenzene supramolecular PES based on hydrogen bonding for electrical memory device application was investigated. A possible switching mechanism based on the charge transfer interaction was proposed through molecular simulation, optical absorption, and cyclic voltammetry. These results render the PES-based supramolecular memory devices as promising components for high-performance polymer memory devices.

Fabrication and Characterization of Biodegradable Metal Based Microelectrodes for In Vivo Neural Recording

MRS Advances ◽  
2019 ◽  
Vol 4 (46-47) ◽  
pp. 2471-2477
Author(s):  
Chaoxing Zhang ◽  
Teresa H. Wen ◽  
Khaleel A. Razak ◽  
Jiajia Lin ◽  
Edgar Villafana ◽  
...  
Keyword(s):  
Neural Recording ◽  
Neural Signals ◽  
Secondary Surgery ◽  
New Class ◽  
Fabrication And Characterization ◽  
Evoked Activity ◽  
First Time ◽  
The Brain

ABSTRACT:Neural electrodes have been widely used to monitor neural signals and/or deliver electrical stimulation in the brain. Currently, biodegradable and biocompatible materials have been actively investigated to create temporary electrodes that could degrade after serving their functions for neural recording and stimulation from days to months. The new class of biodegradable electrodes eliminate the necessity of secondary surgery for electrode removal. In this study, we created biodegradable, biocompatible, and implantable magnesium (Mg)-based microelectrodes for in vivo neural recording for the first time. Specifically, conductive poly-3,4-ethylenedioxythiophene (PEDOT) was first deposited onto Mg microwire substrates by electrochemical deposition, and a biodegradable insulating polymer was subsequently sprayed onto the surface of electrodes. The tip of electrodes was designed to be conductive for neural recording and stimulation, while the rest of electrodes was insulated with a polymer that is biocompatible with neural tissue. The impedance of Mg-based microelectrodes and their performance during neural recording in the auditory cortex of a mouse were studied. The results first demonstrated the capability of Mg-based microelectrodes for in vivo recording of multi-unit stimulus-evoked activity in the brain.

Facile Fabrication and Characterization of Carbon Fiber Microelectrode

2011 ◽  
Vol 287-290 ◽  
pp. 1433-1436
Author(s):  
Zhan Jun Yang ◽  
Yan Yan Ren ◽  
Juan Li ◽  
Xiao Ya Hu
Keyword(s):  
Electron Microscopy ◽  
Carbon Fiber ◽  
Electrochemical Behaviors ◽  
Carbon Fiber Microelectrode ◽  
Facile Fabrication ◽  
Fabrication And Characterization ◽  
Carbon Fiber Microelectrodes ◽  
Novel Strategy ◽  
First Time

A novel strategy was proposed to fabricate carbon fiber microelectrodes (CFMEs). The resultant CFMEs were characterized using scan electron microscopy (SEM) and cyclic voltammetry (CV). Compared to the conventional method, the proposed method only needs a simple heating step for achieving CFMEs without additional pulled, sealed and back-filled procedure. The electrochemical behaviors of 2,4-Dichlorophenol (2,4-DCP) at fabricated CFMEs in pH (2.0-9.0) was for the first time studied and demonstrated a two-charge and two-proton transference process.

scholarly journals Fabrication and Characterization of Thin Film Solar Cell Made from CuIn0.75Ga0.25S2Wurtzite Nanoparticles

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Fengyan Zhang ◽  
Chivin Sun ◽  
Cyril Bajracharya ◽  
Rene G. Rodriguez ◽  
Joshua J. Pak
Keyword(s):  
Thin Film ◽  
Solar Cell ◽  
Fill Factor ◽  
Single Step ◽  
Thin Film Solar Cells ◽  
Wurtzite Phase ◽  
Cigs Thin Film ◽  
Fabrication And Characterization ◽  
First Time

CuIn0.75Ga0.25S2(CIGS) thin film solar cells have been successfully fabricated using CIGS Wurtzite phase nanoparticles for the first time. The structure of the cell is Glass/Mo/CIGS/CdS/ZnO/ZnO:Al/Ag. The light absorption layer is made from CIGS Wurtzite phase nanoparticles that are formed from single-source precursors through a microwave irradiation. The Wurtzite phase nanoparticles were converted to Chalcopyrite phase film through a single-step annealing process in the presence of argon and sulfur at 450°C. The solar cell made from Wurtzite phase nanoparticles showed 1.6% efficiency and 0.42 fill factor.

Sign in / Sign up

Export Citation Format

Share Document