Slotted Waveguide Photodetector for Bandwidth-Responsivity Tradeoff
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Solution Overview
Problem
Existing photonics chips face a trade-off between photodetector bandwidth and responsivity, with improvements in one metric often degrading the other.
Innovation Solution
A photodetector structure with a waveguiding structure comprising a first and second waveguide core, a slot between them, and waveguide core segments adjoined to the photodetector's side edge, enhancing light transfer efficiency and bandwidth without altering the semiconductor layer's shape or size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If design modifications are made to improve the bandwidth of a photodetector, then the bandwidth increases, but the responsivity decreases
Solution Approach 1:
The waveguide core is divided into multiple discrete segments positioned along the photodetector's side edge. These segmented waveguide core segments create multiple light coupling points that enhance bandwidth through parallel signal paths while maintaining overall responsivity through distributed light collection
Solution Approach 2:
A dielectric material is introduced as an intermediary between the waveguide cores and the photodetector semiconductor layer. This dielectric intermediary optimizes optical coupling efficiency and enables polarization diversity while preserving both bandwidth and responsivity through controlled light interaction
2Area of moving object
If the footprint of the photodetector is reduced, then the area decreases, but the light absorption efficiency may be compromised
Solution Approach 1:
The waveguiding structure extends light interaction into the lateral dimension along the side edge of the photodetector. By positioning waveguide segments along the perimeter rather than requiring larger top-area coverage, the design achieves enhanced light absorption within a compact footprint through three-dimensional optical path management
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 structure improves responsivity and coupling efficiency while maintaining or reducing the photodetector's footprint, supporting various polarization modes and enabling efficient light absorption.
Implementation Method 1
a waveguiding structure including a first waveguide core, a second waveguide core, a slot between the first waveguide core and the second waveguide core
Implementation Method 2
A photodetector may be employed in the photonic integrated circuit to convert light, which may be modulated as an optical signal, into an electrical signal
Data Source
Figure 1
Figure 2~2A
Figure 3
AI summary
Structures for a photonics chip that include a photodetector (14) and methods of forming such structures. The structure comprises a photodetector (14) including a pad (24) and a semiconductor layer (26) on the pad (24). The structure further comprises a waveguiding structure including a first waveguide core (12), a second waveguide core (13), a slot between the first waveguide core (12) and the second waveguide core (13), and a plurality of waveguide core segments (20). The waveguiding structure is adjoined to a side edge (23) of the pad (24) adjacent to the semiconductor layer (26). Each of the plurality of waveguide core segments (20) includes a portion that is disposed in the slot.