Polymer Photonic Integrated Circuit with Relief Patterned Grating
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Solution Overview
Problem
The development of low-cost, efficient polymer-based photonic integrated circuits (PICs) for biosensing applications is hindered by the need for complex and expensive materials and intricate light coupling methods, which limit their widespread use due to high manufacturing costs and difficulties in quick sample analysis.
Innovation Solution
A polymer-based PIC comprising a first polymeric layer with a refractive index of 1.3 to 1.8 and a second polymeric layer with a refractive index of 1.4 to 1.9, patterned with a relief pattern to form optical elements such as I/O gratings, 2D waveguides, and spectral shaping elements, using materials like UV curable resins and polyimides, facilitating cost-effective fabrication and improved light coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If advanced nanotechnology and semiconductor processing techniques are used to produce PICs, then the optical performance and precision are improved, but the manufacturing cost and complexity increase significantly
Solution Approach 1:
The patent changes the material parameter from traditional semiconductor materials (silicon, InP) to polymer materials, enabling fabrication using simpler techniques like spin coating and casting while maintaining optical performance. This material substitution allows the use of less complex fabrication processes to achieve the required manufacturing precision.
Solution Approach 2:
The patent employs disposable polymer-based PICs that can be manufactured at low cost using simple techniques. These single-use devices eliminate the need for complex, expensive semiconductor fabrication facilities, making high-precision optical devices accessible through low-cost polymer processing methods.
2Manufacturing precision
If grating couplers are used to ease beam alignment restrictions, then the alignment precision requirement is relaxed, but the coupling loss increases due to design and fabrication complexities
Solution Approach 1:
The patent modifies the grating coupler design parameters specifically for polymer materials, optimizing the groove depth, period, and duty cycle to minimize coupling loss while maintaining relaxed alignment tolerances. The grating structure is tailored to the refractive index and absorption characteristics of polymer waveguides.
Solution Approach 2:
The patent implements localized optimization of the grating coupler structure at the input and output interfaces of the polymer waveguide. The grating parameters are specifically designed for these interface regions to maximize coupling efficiency while keeping the rest of the waveguide structure simple and low-cost.
3Loss of energy
If precise alignment of optical waveguides is performed for repeated PIC replacement, then the coupling efficiency is improved, but the time required for sample analysis increases
Solution Approach 1:
The patent incorporates alignment markers and pre-defined geometric features during the polymer PIC fabrication process. These preliminary structural elements enable rapid alignment and coupling when devices are replaced, eliminating the need for time-consuming alignment procedures while maintaining high coupling efficiency.
Solution Approach 2:
The patent designs the polymer PIC with self-aligning features such as tapered waveguide edges and integrated alignment markers that automatically guide the coupling process. This self-service alignment mechanism reduces the time required for repeated device replacement while maintaining efficient light coupling.
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 solution enables the creation of complex optical devices at a lower cost, with enhanced light coupling capabilities, allowing for efficient and rapid biosensing without the need for expensive materials or intricate alignment, making them suitable for disposable sensors and quick sample analysis.
Implementation Method 1
an interface between the first polymeric layer and the second polymeric layer is patterned with a relief pattern to form a plurality of optical elements
Implementation Method 2
a first polymeric layer having a refractive index of from 1.3 to 1.8 at a wavelength of 1300 nm; and a second polymeric layer on the first polymeric layer, the second polymeric layer having a refractive index of from 1.4 to 1.9 at a wavelength of 1300 nm
Implementation Method 3
Grating couplers ease that restriction by an order of magnitude or two
Data Source
AI summary
There is provided a polymer based photonic integrated circuit (PIC) comprising: a first polymeric layer, the first polymeric layer having a refractive index of from 1.3 to 1.8 at a wavelength of 1300 nm; and a second polymeric layer on the first polymeric layer, the second polymeric layer having a refractive index of from 1.4 to 1.9 at a wavelength of 1300 nm and an optical loss of at most 10 dB/cm at a wavelength of 1300 mm. The difference between the refractive index of the first polymeric layer and the refractive index of the second polymeric layer is at least 0.1 at a wavelength of 1300 nm. An interface between the first polymeric layer and the second polymeric layer is patterned with a relief pattern to form a plurality of optical elements. The plurality of optical elements comprises an I/O grating, a 2D waveguide, and a spectral shaping element.