High-Order Harmonic Generation for Attosecond Electric Field Probing
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Solution Overview
Problem
Current methods are inadequate for generating and measuring ultra-short probe signals in the ultraviolet regime for dynamic and high-resolution probing of internal electric fields in semiconductor devices, as they are limited by the duration of standard laser pulses and lack efficient techniques for spectral up-conversion from infrared to ultraviolet ranges.
Innovation Solution
The method involves generating high-order harmonics in semiconductor or dielectric media using a semiconductor-laser interaction region, where a driving laser field interacts with the medium to produce high-order harmonics, which are then directed and measured to construct a high-resolution dynamic profile of internal electric fields, utilizing a mid-infrared laser pulse and a secondary control field to modulate the harmonic response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If standard laser pulses are used for probing, then the setup is simple and easy to operate, but the temporal resolution is insufficient for dynamic phenomena
Solution Approach 1:
The patent changes the fundamental parameter of laser pulse duration by generating high-order harmonics that produce attosecond-scale pulses (sub-femtosecond duration). This is achieved by taking a conventional femtosecond laser pulse and generating harmonics that are 100-1000 times shorter in duration, thereby achieving the required temporal resolution for dynamic phenomena in semiconductor devices.
Solution Approach 2:
The patent uses periodic laser pulses with specific durations and frequencies to generate high-order harmonics. The periodic nature of the laser pulses enables the generation of coherent harmonic radiation that can be used as ultra-short probe signals. The periodic action is controlled through the laser driver frequency and the nonlinear interaction in the semiconductor material.
2Illumination intensity
If infrared laser pulses are used, then the generation process is efficient, but the spectral range is insufficient for ultraviolet regime probing
Solution Approach 1:
The patent transitions from infrared to ultraviolet spectral ranges by generating high-order harmonics. This dimensional change in frequency space is achieved through the nonlinear optical process where the fundamental infrared frequency (ω) is multiplied to produce harmonics at frequencies n×ω, where n can be 10-100 or higher, thereby reaching the ultraviolet regime from the infrared pump source.
Solution Approach 2:
The patent changes the frequency parameter of the laser radiation through harmonic generation. By adjusting the order of the harmonic (n) and the fundamental frequency (ω), the system can tune the output spectral range from infrared to ultraviolet. This parameter change enables the same physical setup to operate across different spectral regimes without requiring separate laser sources.
3Measurement precision
If longer probe pulses are used, then the measurement system is simpler, but the resolution of dynamic electric fields is degraded
Solution Approach 1:
The patent employs periodic laser pulses with carefully controlled durations to achieve the desired balance between resolution and signal strength. The periodic nature allows for coherent accumulation of harmonic signals while maintaining ultra-short duration. The pulse duration is controlled through the driver laser parameters and the nonlinear interaction length, enabling optimization of both resolution and measurement capability.
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
This approach enables the generation and measurement of high-order harmonics, allowing for high-resolution dynamic imaging of internal electric fields in semiconductor devices, overcoming the limitations of standard laser pulse durations and achieving attosecond-scale temporal resolution.
Implementation Method 1
generating one or more high-order harmonics in a semiconductor or dielectric medium, directing the one or more high-order harmonics towards one or more semiconductor devices
Implementation Method 2
facilitate an interaction of one or more high-order harmonics with one or more internal electric fields of the one or more semiconductor devices
Data Source
AI summary
A method and apparatus for generating high-order harmonics in a solid-state medium comprising integrated semiconductor devices and electronics. The high-order harmonics interact with and are modified by the internal electric field associated with the operation of the integrated semiconductor devices and electronics. Measurement of the high-order harmonics after modification by the internal electric fields amounts to high resolution (temporal and spatial) dynamic imaging of the internal electric fields associated with the integrated semiconductor devices and electronics.