Entangled-Photon Pair Emitter With Piezoelectric Stress Control
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Solution Overview
Problem
Existing entangled-photon pair emitting devices struggle to control the wavelength range of emitted photons effectively, particularly when applying stress to quantum dots, as the wavelength variation is limited and not widely controllable.
Innovation Solution
An entangled-photon pair emitting device incorporating a piezoelectric structure with an opening and a stress transfer medium, where a semiconductor thin-film and quantum dot are positioned on the stress transfer medium, allowing for increased stress application and control over the wavelength range through the use of a piezoelectric structure and electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a strong stress is applied to the quantum dot to widely control the wavelength range, then the wavelength control range is improved, but the emission efficiency and optical loss are worsened
Solution Approach 1:
The patent introduces a stress transfer medium as an intermediary between the piezoelectric structure and the quantum dot. This medium efficiently transmits the stress generated by the piezoelectric structure to the quantum dot, enabling strong stress application for wide wavelength control while minimizing energy loss through optimized stress transmission pathways.
Solution Approach 2:
The patent utilizes the piezoelectric effect to dynamically change the stress parameter applied to the quantum dot. By applying voltage to the piezoelectric structure, the stress on the quantum dot can be precisely controlled, enabling wide wavelength tuning while maintaining optimal emission efficiency through controlled parameter variation.
2Adaptability or versatility
If a strong stress is applied to the quantum dot to widely control the wavelength range, then the wavelength control range is improved, but the emission efficiency is worsened
Solution Approach 1:
The stress transfer medium serves as an intermediary that enables strong stress application while preserving emission efficiency. The medium is specifically designed to transmit stress effectively to the quantum dot while maintaining the structural integrity and optical properties necessary for high-efficiency photon emission.
Solution Approach 2:
The patent applies stress locally to the quantum dot region through the piezoelectric structure and stress transfer medium, rather than applying uniform stress throughout the entire device. This localized stress application achieves wide wavelength control for the quantum dot while minimizing the impact on overall emission efficiency.
3Adaptability or versatility
If the quantum dot structure is made non-ideal (non-perfectly circular) to enable stress application, then the wavelength control is improved, but the manufacturing precision is worsened
Solution Approach 1:
The patent separates the wavelength control function from the quantum dot structure itself by introducing external piezoelectric structures and stress transfer media. This segmentation allows the quantum dot to maintain its ideal structure for high-precision manufacturing while the wavelength control is achieved through external stress application.
Solution Approach 2:
The stress transfer medium acts as an intermediary that enables wavelength control without requiring modification of the quantum dot structure. The medium transmits stress from the piezoelectric structure to the quantum dot, allowing wavelength tuning while preserving the quantum dot's ideal manufactured shape.
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 device achieves enhanced entangled-photon pair emission efficiency and widens the wavelength control range by increasing the stress intensity applied to the quantum dot, while reducing optical loss and improving light extraction efficiency.
Implementation Method 1
a piezoelectric structure having a first surface and a second surface, which face each other, wherein the piezoelectric structure includes an opening passing through the piezoelectric structure from the first surface to the second surface; an upper electrode disposed on the first surface of the piezoelectric structure; and a lower electrode disposed on the second surface of the piezoelectric structure
Implementation Method 2
a stress transfer medium configured to fill the opening
Implementation Method 3
When the quantum dot has a size less than an excitonic Bohr radius, the quantum dot may emit photons having various emission wavelengths by a quantum confinement effect
Data Source
AI summary
An entangled-photon pair emitting device according to an embodiment of the inventive concept includes a piezoelectric structure having a first surface and a second surface, which face each other, wherein the piezoelectric structure includes an opening passing through the piezoelectric structure from the first surface to the second surface, a stress transfer medium that fills the opening, a light source emitting part disposed on the stress transfer medium, an upper electrode disposed on the first surface of the piezoelectric structure, and a lower electrode disposed on the second surface of the piezoelectric structure. Here, the light source emitting part includes a semiconductor thin-film and a quantum dot in the semiconductor thin-film.