Microbolometer Central Support Structure for Large Platforms

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Solution Overview

Problem

Current microbolometer detectors face challenges in mechanical stability and thermal insulation as the platform size increases, particularly for far-infrared and terahertz applications, leading to structural reliability issues and unwanted thermal bridges.

Innovation Solution

A microbolometer detector design featuring a support structure with posts aligned under the central region of the platform, providing enhanced mechanical stability and reduced mechanical stress, along with thermally insulated support arms and a thermistor located in the peripheral region, facilitating efficient radiation collection and improved signal-to-noise ratio.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of moving object

If the platform size is increased for far-infrared and terahertz applications, then radiation collection efficiency is improved, but mechanical stability deteriorates

Engineering Contradiction:

Improveplatform areaVSAvoidmechanical stability

Core Design Contradiction:

Area of moving objectVSStability of the object's composition

Solution Approach 1:

The patent inverts the conventional support structure arrangement by positioning support posts under the central region of the platform rather than at the edges. This inversion provides superior mechanical support for large-area platforms, preventing deformations and maintaining structural integrity while enabling the platform to achieve larger sizes for improved radiation collection in far-infrared and terahertz applications.

Inventive Principle:

Principle #13The other way round (Inversion)

2Area of moving object

If the platform size is increased, then radiation collection efficiency is improved, but thermal insulation deteriorates due to unwanted thermal bridges

Engineering Contradiction:

Improveplatform areaVSAvoidthermal insulation

Core Design Contradiction:

Area of moving objectVSLoss of energy

Solution Approach 1:

The patent inverts the conventional support structure arrangement by positioning support posts under the central region of the platform rather than at the edges. This inversion minimizes thermal bridge formation between the platform and substrate, improving thermal insulation while enabling larger platform areas for enhanced radiation collection efficiency in far-infrared and terahertz applications.

Inventive Principle:

Principle #13The other way round (Inversion)

3Ease of manufacture

If edge support configuration is used with large platforms, then manufacturing is simplified, but structural reliability deteriorates

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidstructural reliability

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent inverts the conventional edge support configuration by positioning support posts under the central region of the platform. This inverted arrangement significantly improves structural reliability for large-area platforms used in far-infrared and terahertz applications, while remaining compatible with standard integrated circuit fabrication techniques to maintain manufacturing feasibility.

Inventive Principle:

Principle #13The other way round (Inversion)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The design enhances mechanical stability and reduces deformations, preventing thermal bridges and improving the performance of microbolometers with large platforms, particularly in far-infrared and terahertz applications, while maintaining sensitivity and spatial resolution.

Implementation Method 1

The support structure generally includes support posts and arms (or legs) that provide mechanical stability and thermal insulation to the platform

Methodology Applied

Scientific EffectThermal insulation: Thermal Insulation

Implementation Method 2

The platform is generally held above and thermally insulated from a substrate by a support structure, and is provided with a thermistor, which is the resistive element whose electrical resistance changes in response to temperature variations caused by the absorbed radiation

Methodology Applied

Scientific EffectTemperature-dependent electrical resistance: Thermistor

Implementation Method 3

Thermal detectors are detectors that operate by absorbing energy from electromagnetic radiation incident thereon and by converting the heat thus generated into an electrical signal representative of the amount of absorbed radiation

Methodology Applied

Scientific EffectElectromagnetic radiation absorption: Absorption (EM radiation)

Data Source

PatentUS8809786B2Microbolometer detector with centrally-located support structure

Publication Date: 2014.08.19 INSTITUT NATIONAL D'OPTIQUE

AI summary

A microbolometer detector has an improved support structure. The microbolometer detector includes a substrate and a support structure including at least one post connected to and projecting substantially vertically from the substrate. The microbolometer detector also includes a platform held above the substrate and including a central region substantially vertically aligned with the at least one post of the support structure and a peripheral region surrounding the central region, the platform being supported by the support structure from the central region thereof. The microbolometer further includes at least one thermistor located in the peripheral region of the platform. A microbolometer focal plane array may also include multiple microbolometer detectors arranged in a two-dimensional array. The support structures are particularly well suited for supporting relatively large platforms of microbolometer detectors, particularly for far-infrared and terahertz detection and spectroscopy applications.