Nano-structure Light Propagation Control via Plasmonic Resonance
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Solution Overview
Problem
Optical devices face limitations in miniaturization due to the diffraction limit of light, making it challenging to reduce their size to several micrometers or less, which restricts the development of integrated optical circuits.
Innovation Solution
The use of nano-structures with specific hexahedral shapes and sizes in a metal layer on a substrate to control the propagation direction of light, including a light source, by adjusting dimensions and intervals between nano-structures, and generating surface plasmons to enhance light manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If optical devices are miniaturized to reduce size, then device size is reduced, but light propagation control becomes difficult due to diffraction limit
Solution Approach 1:
The patent transitions from conventional planar optical components to three-dimensional nano-structures carved into the metal layer. By utilizing vertical depth dimension in addition to horizontal dimensions, the optical device achieves size reduction while maintaining effective light interaction through volumetric nano-structures that can be precisely positioned at different depths within the metal layer.
Solution Approach 2:
The patent employs systematic variation of nano-structure parameters including size, shape, depth, and spatial arrangement to control light propagation characteristics. By adjusting these geometric parameters, the device optimizes light-matter interaction at the nanoscale, enabling precise control of light direction and resonance wavelengths despite the reduced device size.
2Ease of operation
If nano-structures are used to control light propagation, then light directionality is improved, but device complexity increases
Solution Approach 1:
The patent utilizes asymmetric nano-structure geometries with different dimensions along various axes to achieve directional light propagation. The asymmetric shapes create preferential light emission directions by manipulating surface plasmon resonance modes, enabling controlled light directionality without requiring complex multi-component assemblies.
Solution Approach 2:
The patent designs nano-structures that simultaneously perform multiple functions: they act as light sources, waveguides, and resonators within a single integrated configuration. This multi-functionality reduces the need for separate components, thereby managing device complexity while achieving sophisticated light propagation control through unified nano-structure design.
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
This approach allows for precise control of light propagation and resonance wavelengths, enabling the development of smaller optical devices and integrated circuits while maintaining efficient light transmission and directionality.
Implementation Method 1
a surface plasmon may be generated on the metal layer
Data Source
AI summary
An optical device may include a substrate, a metal layer on the substrate, at least one first nano-structure in the layer, and at least one second nano-structure in the layer. The at least one first nano-structure may include a light source. The at least one first and second nano-structures may be spaced apart. A method of controlling a propagation direction of light output from an optical device that includes a metal layer on a substrate may include disposing first and second nano-structures in the layer; disposing at least one light source in the first nano-structure; and controlling the propagation direction of the light output from the at least one light source by changing at least one of a shape of the first nano-structure, a shape of the second nano-structure, a size of the first nano-structure, a size of the second nano-structure, and an interval between the first and second nano-structures.