Resonant Inelastic Tunneling Junction for Plasmonic Light Generation
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Solution Overview
Problem
Conventional plasmonic devices face limitations in integration with nanoelectronics due to size constraints and modulation speed, with existing electrically-driven surface plasmon sources exhibiting low external quantum efficiency and limited tunability.
Innovation Solution
An on-chip electrically-driven plasmonic circuit utilizing a conductive quantum well junction with silver nanorods to facilitate resonant inelastic electron tunneling, generating light in visible, near-infrared, and mid-infrared spectrums, enhancing external quantum efficiency and tunability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional photonic elements are used to carry optical signals, then information transmission capacity is improved (over 1,000 times electronic components), but device size becomes large due to optical diffraction limit and integration with nanoelectronics becomes difficult
Solution Approach 1:
The patent replaces conventional photonic elements with a plasmonic device that uses surface plasmon polaritons (SPPs) for signal transmission. This substitution enables optical-like bandwidth (over 1,000 times electronic components) while achieving nanoscale dimensions compatible with modern nanoelectronics, effectively resolving the size-capacity tradeoff through a fundamentally different physical mechanism.
Solution Approach 2:
The patent changes the operating regime from conventional diffraction-limited optics to the plasmonic regime, where electromagnetic energy is coupled to electron oscillations at metal-dielectric interfaces. This parameter change enables sub-wavelength confinement of optical energy, achieving both high information capacity and small device footprint.
2Productivity
If existing electrically-driven surface plasmon sources are used, then plasmonic signal generation is achieved, but external quantum efficiency is low and tunability is limited
Solution Approach 1:
The patent implements dynamically tunable plasmonic signal generation by applying external voltage to adjust the Fermi level alignment between the quantum well junction and metal electrodes. This enables continuous tuning of the surface plasmon polariton frequency and wavelength, achieving both high external quantum efficiency (30%) and broadband tunability across visible, near-infrared, and mid-infrared spectrums.
Solution Approach 2:
The patent changes the operational parameters of the plasmonic source by utilizing resonant inelastic electron tunneling in a quantum well junction structure. By adjusting the applied voltage and quantum well depth, the system achieves enhanced external quantum efficiency (30%) and broadband spectral tunability, overcoming the limitations of conventional plasmonic sources.
3Ease of operation
If elastic tunneling is allowed in the quantum well junction, then electron transport is facilitated, but light generation efficiency is reduced due to non-radiative recombination
Solution Approach 1:
The patent applies local quality control by engineering the quantum well junction to have spatially varying properties: the quantum well depth and width are optimized to create resonant states that favor inelastic tunneling at specific energy levels. This local optimization ensures that electron transport occurs predominantly through radiative recombination channels, converting electron energy into surface plasmon polaritons rather than heat.
Solution Approach 2:
The patent changes the tunneling characteristics by adjusting the quantum well parameters (depth, width, material composition) to create resonant states. This parameter optimization suppresses elastic (non-radiative) tunneling while enhancing inelastic (radiative) tunneling, thereby improving light generation efficiency while maintaining electron transport functionality.
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 approach achieves up to 30% external quantum efficiency and enables broadband tunability, addressing the limitations of existing plasmonic devices by leveraging resonant inelastic electron tunneling in a metal-insulator-metal heterostructure with monocrystalline silver nanorods.
Implementation Method 1
The conductive quantum well junction may be configured to enter into a resonant state to inelastically tunneling one or more electrons
Implementation Method 2
utilizing a conductive quantum well junction with silver nanorods to facilitate resonant inelastic electron tunneling
Data Source
AI summary
An apparatus, a method, and an optical device for generating light. A conductive quantum well junction is positioned between a first electrode and a second electrode. The conductive quantum well junction is configured to enter into a resonant state to inelastically tunneling one or more electrons. The conductive quantum well junction may include a first dielectric layer, a third conductive layer, and a second dielectric layer. The third conductive layer may be positioned between the first dielectric layer and the second dielectric layer. The first dielectric layer may be coupled to the second electrode and the second dielectric layer is coupled to the first electrode.