Slab Waveguide SNSPD Layout for Multi-Mode Photon Detection
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Solution Overview
Problem
Existing superconducting nanowire single photon detectors (SNSPDs) face limitations in detecting multi-mode signals due to reduced detection speed and manufacturing challenges, particularly when integrated with optical cavities, and waveguide-integrated SNSPDs are limited to single or few-mode signals.
Innovation Solution
An optical device comprising an optical slab waveguide, an optical coupling element, and an SNSPD-system with nanowires arranged around the coupling element to detect multi-mode signals in-plane, utilizing a scattering-based coupling element to distribute the signal in multiple directions for efficient detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard SNSPDs use long or many meanders to achieve high fill factor and good detector efficiency, then quantum efficiency is improved, but detection speed decreases and manufacturing complexity increases
Solution Approach 1:
The patent transitions from out-of-plane light coupling to in-plane coupling by integrating the nanowire detector directly into the waveguide layer. This dimensional change allows the absorption length to correspond to the detector length, achieving high quantum efficiency with much shorter nanowire lengths, thereby maintaining fast detection speed while improving efficiency.
Solution Approach 2:
The patent extracts the nanowire detector from the traditional out-of-plane configuration and repositions it within the waveguide plane. This extraction eliminates the need for complex meander structures and optical cavities, simplifying the device while achieving both high efficiency and fast response.
2Reliability
If standard SNSPDs use long or many meanders to achieve high fill factor, then quantum efficiency is improved, but manufacturing demands and complexity increase
Solution Approach 1:
By moving the nanowire detector into the waveguide plane and using in-plane coupling, the patent eliminates the need for complex out-of-plane optical cavities and meander structures. The straight nanowire integrated in the waveguide layer achieves high quantum efficiency with simpler fabrication processes.
Solution Approach 2:
The patent merges the waveguide and detector into a single integrated structure where the nanowire is deposited directly in the waveguide layer. This consolidation eliminates separate optical cavity components and complex meander patterns, reducing manufacturing steps and improving yield.
3Reliability
If waveguide-integrated SNSPDs are used to detect broadband light in a waveguide, then quantum efficiency is improved, but the detectors are limited to single-mode or few-mode waveguides only
Solution Approach 1:
The patent creates a universal detector platform that can handle both single-mode and multi-mode signals. By using a multi-mode waveguide with multiple nanowires arranged to detect different spatial modes, the system achieves high quantum efficiency while gaining the versatility to detect broadband light carrying multiple optical modes.
Solution Approach 2:
The patent segments the detector into multiple nanowires, each capable of detecting specific spatial modes. This segmentation allows the system to resolve and detect multiple optical modes simultaneously while maintaining the high quantum efficiency of waveguide-integrated detection.
4Reliability
If optical cavities are used to improve photon absorption in standard SNSPDs, then quantum efficiency is improved, but spectral range is limited and additional manufacturing steps are required
Solution Approach 1:
The patent extracts the nanowire detector from the traditional out-of-plane configuration requiring optical cavities and repositions it within the waveguide plane. This extraction eliminates the need for complex optical cavity structures and associated manufacturing steps while achieving high quantum efficiency through in-plane coupling.
Solution Approach 2:
By transitioning to in-plane coupling within the waveguide layer, the patent eliminates the need for out-of-plane optical cavities. The nanowire integrated in the waveguide plane provides sufficient interaction length for high efficiency detection without requiring additional cavity manufacturing steps.
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
Enables high quantum efficiency and detailed information about multi-mode signals, facilitating use as a single photon camera with improved manufacturability and reduced manufacturing demands.
Implementation Method 1
utilizing a scattering-based coupling element to distribute the signal in multiple directions for efficient detection
Implementation Method 2
superconducting nanowire single photon detectors (SNSPDs)
Data Source
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AI summary
The invention relates to an optical device (10), comprising: i) an optical slab waveguide (12), ii) an optical coupling element (14), iii) a transmission channel (16) for transmitting an optical signal comprising a multitude of signal modes onto the coupling element (14) with an angle of incidence of 75° or less, and iv) an SNSPD-system, comprising one or more nanowires (18), wherein the coupling element (14) is designed to at least partially couple the optical signal transmitted by the transmission channel (16) into the plane of the slab waveguide (12), wherein the slab waveguide (12) is designed so that the coupled parts of the optical signal can be guided away from the coupling element (14) in the plane of the slab waveguide (12) in a multitude of different directions, wherein the one or more nanowires (18) of the SNSPD-system are arranged around the coupling element (14) so that that the coupled parts of the optical signal that are guided away from the coupling element (14) through the slab waveguide (12) can interact with the one or more nanowires (18) of the SNSPD-system in a plurality of different detection directions, wherein the plurality of different detection directions comprises at least 3 detection directions D that enclose an angle of 10° or more with all of the other detection directions D.