Publication

Coating high aspect-ratio channels of multi-aperture vision sensor using Micromoulding in Capillaries (MIMIC)

2011
Student Projects

Abstract

The motivation for this project is to prevent optical cross-talk in an optical sensor array, named ommatidia and fabricated in the CURVACE project. The goals of the project are to show that Micromoulding in Capillaries (or MIMIC) is a very effective and cost-efficient method to encapsulate sensors with high aspect-ratio structures. To this end, many challenging problems have been solved. Many achievements have been attained, including the fabrication of high aspect-ratio (10:1) structured PDMS moulds (height 650μm) and the fabrication of tightly packed high aspect-ratio SU-8 structures (height 650μm). Furthermore, the successful alignment of high aspect-ratio structured PDMS moulds into high aspect-ratio sensor structures, in order to perform encapsulation, has also been performed. These results show that use of the MIMIC technique for sensor encapsulation is promising, both in terms of performance and in terms of cost-effectiveness.

Official source

https://infoscience.epfl.ch/entities/publication/392c9d15-649f-4eda-bffa-9854f04da0a7

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2011
Student Projects

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/392c9d15-649f-4eda-bffa-9854f04da0a7

About this result

Related concepts (29)

Aspect ratio

The aspect ratio of a geometric shape is the ratio of its sizes in different dimensions. For example, the aspect ratio of a rectangle is the ratio of its longer side to its shorter side—the ratio of width to height, when the rectangle is oriented as a "landscape". The aspect ratio is most often expressed as two integer numbers separated by a colon (x:y), less commonly as a simple or decimal fraction. The values x and y do not represent actual widths and heights but, rather, the proportion between width and height.

Sensor

A sensor is a device that produces an output signal for the purpose of sensing a physical phenomenon. In the broadest definition, a sensor is a device, module, machine, or subsystem that detects events or changes in its environment and sends the information to other electronics, frequently a computer processor. Sensors are used in everyday objects such as touch-sensitive elevator buttons (tactile sensor) and lamps which dim or brighten by touching the base, and in innumerable applications of which most people are never aware.

Photodiode

A photodiode is a light-sensitive semiconductor diode. It produces current when it absorbs photons. The package of a photodiode allows light (or infrared or ultraviolet radiation, or X-rays) to reach the sensitive part of the device. The package may include lenses or optical filters. Devices designed for use specially as a photodiode use a PIN junction rather than a p–n junction, to increase the speed of response. Photodiodes usually have a slower response time as their surface area increases.