Buried Metal Grating for Extraordinary Optical Transmission
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Solution Overview
Problem
The integration of metal into optoelectronic devices for active modulation and optical properties is hindered by parasitic absorption and reflection losses, which compromise the performance of these devices, and existing methods to reduce reflectivity, such as nanostructuring, do not effectively enable efficient electrical contact.
Innovation Solution
A buried metal contact layer with an arrangement of holes is formed on a semiconductor structure using metal-assisted chemical etching, creating nanopillar structures that allow for extraordinary optical transmission (EOT) and provide both electrical contact and optical coupling, enabling high light transmission and uniform current distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If metal is integrated into optoelectronic devices for electrical contact and optical properties, then electrical conductivity and optical confinement are improved, but parasitic absorption and reflection losses increase
Solution Approach 1:
The metal contact layer is segmented into a periodic grating structure with holes, dividing the continuous metal film into discrete elements. This segmentation allows light to pass through the holes while the metal segments provide electrical contact, reducing overall optical losses while maintaining electrical functionality.
Solution Approach 2:
The metal grating structure creates local variations in optical and electrical properties. The holes provide local optical transmission channels, while the metal segments provide local electrical contact. This local differentiation allows simultaneous optimization of optical transmission and electrical contact in different regions of the same structure.
2Loss of energy
If nanostructuring is applied to reduce reflectivity, then optical transmission is improved, but efficient electrical contact is not enabled
Solution Approach 1:
The metal grating structure serves multiple functions simultaneously: it provides electrical contact through the metal segments, reduces reflection through the periodic nanostructure, and enables optical transmission through the holes. This multi-functionality resolves the contradiction by making a single structure capable of both optical and electrical functions.
Solution Approach 2:
The structure combines metal and air (or dielectric) materials in a periodic grating pattern, creating a composite structure that exhibits both metallic electrical conductivity and optical transmission properties. The composite nature allows simultaneous achievement of electrical contact and optical performance.
3Reliability
If metal film is used to provide uniform lateral voltage distribution, then electrical contact quality is improved, but optical reflectivity increases
Solution Approach 1:
The continuous metal film is segmented into a periodic grating pattern, maintaining lateral voltage distribution through the connected metal segments while creating openings for light transmission. The segmentation reduces optical blocking while preserving electrical functionality.
Solution Approach 2:
The metal grating structure can be viewed as a porous metal structure where the holes serve as transmission channels. This porous configuration allows light to pass through while the metal framework maintains electrical conductivity and voltage distribution.
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 buried metal contact layer achieves at least 50% transmission of incident radiation at a peak wavelength, enhancing light transmission and electrical contact in optoelectronic devices while minimizing absorption and reflection losses.
Implementation Method 1
A buried metal contact layer with an arrangement of holes is formed on a semiconductor structure using metal-assisted chemical etching, creating nanopillar structures that allow for extraordinary optical transmission (EOT)
Implementation Method 2
A buried metal contact layer with an arrangement of holes is formed on a semiconductor structure using metal-assisted chemical etching
Data Source
AI summary
An optoelectronic device includes an etched body comprising a buried metal contact layer on a top surface of a semiconductor structure, which comprises one or more semiconductor layers. The buried metal contact layer includes an arrangement of holes therein. A plurality of nanopillar structures protrude from the top surface of the semiconductor structure and pass through the arrangement of holes. Each nanopillar structure is surrounded at a base thereof by a portion of the buried metal contact layer. When the etched body is exposed to incident radiation having a wavelength in the range from about 300 nm to about 10 microns, at least about 50% of the incident radiation is transmitted through the etched body at a peak transmission wavelength λmax.