Nonvolatile Protein Memory with Optical Write and Electrical Readout
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Solution Overview
Problem
Conventional bioelectronic devices face limitations such as limited self-assembly processes, difficulty in interfacing with external devices, and challenges in downsizing, particularly for optics-based memory devices, which hinder their commercialization and practical application.
Innovation Solution
A nonvolatile protein memory system is developed with a microfluidic channel having a pH gradient, photosensitive proteins, and electrodes for optical write/erase operations and electrical readout, utilizing microfluidic MEMS fabrication and CMOS integrated circuits for non-contact impedance measurement, enabling continuous data retention and downsizing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an optics-based memory device is used to achieve optical write/erase operations, then write/erase functionality is improved, but device size and system complexity increase
Solution Approach 1:
The patent extracts the optical system from the memory device structure, using external light sources to illuminate the microfluidic channel containing photosensitive proteins. This separation eliminates the need for integrated optical components within the device, reducing device complexity while maintaining optical write/erase functionality.
Solution Approach 2:
The patent introduces photosensitive proteins as intermediaries that convert optical energy into positional changes. These proteins act as a mediator between the external optical system and the memory storage mechanism, enabling optical write/erase operations without requiring complex integrated optical components.
2Ease of manufacture
If conventional bioelectronic devices use self-assembly processes, then manufacturing simplicity is improved, but device functionality and external interfacing are limited
Solution Approach 1:
The patent segments the device into distinct functional modules: a microfluidic channel for protein positioning, separate electrode systems for electrical readout, and controlled pH gradient zones. This modular segmentation enables both simplified manufacturing through self-assembly and versatile external interfacing through standardized connection points.
Solution Approach 2:
The patent creates a multi-functional system where the microfluidic channel serves multiple purposes: containing photosensitive proteins, establishing pH gradients for positioning, and enabling both optical and electrical operations. This universality allows the device to maintain manufacturing simplicity while achieving diverse functionality including external device interfacing.
3Measurement precision
If optical readout is used to maintain data integrity, then measurement accuracy is improved, but power consumption and device size increase
Solution Approach 1:
The patent employs electrical readout that utilizes the inherent electrical properties of the photosensitive proteins and the microfluidic environment. The system measures impedance changes that occur naturally during protein positioning, eliminating the need for additional energy-intensive measurement equipment while maintaining readout accuracy.
Solution Approach 2:
The patent replaces optical readout mechanisms with electrical measurement methods. Instead of using complex optical detection systems that consume high power, the system uses simple electrical impedance measurements to detect protein positions, significantly reducing power consumption while maintaining measurement precision.
4Adaptability or versatility
If memory devices use additional optical systems for write/erase operations, then optical functionality is improved, but downsizing becomes difficult
Solution Approach 1:
The patent transitions from integrated three-dimensional optical components to a two-dimensional planar microfluidic channel structure. The optical write/erase operations are performed by illuminating the channel from above or below, utilizing the thin profile of the microfluidic device to achieve optical functionality without increasing device volume.
Solution Approach 2:
The patent uses a thin microfluidic channel as the primary device structure, allowing optical penetration through the thin film while maintaining a compact form factor. The photosensitive proteins are contained within this thin channel, enabling optical operations without requiring bulky optical components.
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 system allows for efficient optical write and erase operations without refreshing the memory state, maintaining data integrity during readout and enabling integration into wearable or implantable devices due to its biocompatibility and reduced power consumption.
Implementation Method 1
a photosensitive protein disposed in the microfluidic channel... a light source causing a position change of the photosensitive protein
Implementation Method 2
a first electrode and a second electrode disposed on the microfluidic channel... detecting a position change of the photosensitive protein... readout circuit measuring impedance between the first electrode and the second electrode in a non-contact manner
Implementation Method 3
a substrate including a microfluidic channel having a pH gradient
Data Source
AI summary
A nonvolatile protein memory system with optical write/erase and electrical readout capability is provided. The nonvolatile protein memory system includes: a substrate including a microfluidic channel having a pH gradient; a photosensitive protein disposed in the microfluidic channel; and a first electrode and a second electrode disposed on the microfluidic channel and spaced apart from each other and detecting a position change of the photosensitive protein in the microfluidic channel.