Related Experiment Video
Updated: Jun 11, 2025
10:52
Direct Imaging of Laser-driven Ultrafast Molecular Rotation
Published on: February 4, 2017
9.7K
Bloch-Wave Phase Matching of High Harmonic Generation in Solids
Liang Li1,2, Yuntian Zhang1, Jiapeng Li1
1Wuhan National Laboratory for Optoelectronics and School of Physics, <a href="https://ror.org/00p991c53">Huazhong University of Science and Technology</a>, Wuhan 430074, China.
Physical Review Letters
|September 27, 2024
Summary
High harmonic generation (HHG) in solids is inefficient due to wavelet cancellation. A novel Bloch-wave phase-matching scheme enhances HHG by nearly 3 orders of magnitude through crystal engineering.
Area of Science:
- Solid-state physics
- Nonlinear optics
- Quantum optics
Background:
- The conversion efficiency of high harmonic generation (HHG) in solids is a subject of longstanding doubt, often found to be lower than theoretical expectations.
- High electron densities in solids contribute to complex interactions affecting HHG efficiency.
Purpose of the Study:
- To investigate the dynamical process of HHG in solids using wavelet interference.
- To identify the underlying mechanisms limiting HHG efficiency in solid-state materials.
- To propose a novel scheme for enhancing solid-state HHG.
Main Methods:
- Analysis of high harmonic generation (HHG) in solids through the lens of wavelet interference.
- Investigation of the phase-matching conditions for coupled waves in nonlinear optics within solid-state systems.
- Development of a Bloch-wave phase-matching scheme.
Main Results:
- Wavelet interference analysis reveals that most wavelets are out of phase, leading to coherent cancellation and reduced HHG efficiency.
- A small fraction of excited electrons effectively contributes to HHG, explaining the low conversion rates.
- The proposed Bloch-wave phase-matching scheme demonstrates potential for nearly 3 orders of magnitude enhancement in solid HHG.
Conclusions:
- The low efficiency of solid HHG is attributed to coherent cancellation of wavelets.
- Engineering crystal structures using the Bloch-wave phase-matching scheme can significantly enhance HHG.
- This work provides theoretical guidance for developing efficient all-solid-state ultraviolet light sources.
Related Concept Videos
01:28Standing Waves in a Cavity
883
A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
883
01:03Modes of Standing Waves - I
2.9K
A close look at earthquakes provides evidence for the conditions appropriate for resonance, standing waves, and constructive and destructive interference. A building may vibrate for several seconds with a driving frequency matching the building's natural frequency of vibration; this produces a resonance that results in one building collapsing while the neighboring buildings do not. Often, buildings of a certain height are devastated, while other taller buildings remain intact. This...
2.9K
00:53Sound Waves: Interference
3.7K
Sound waves can be modeled either as longitudinal waves, wherein the molecules of the medium oscillate around an equilibrium position, or as pressure waves. When two identical waves from the same source superimpose on each other, the combination of two crests or two troughs results in amplitude reinforcement known as constructive interference. If two identical waves, that are initially in phase, become out of phase because of different path lengths, the combination of crests with troughs...
3.7K
01:07Propagation of Waves
2.3K
When a wave propagates from one medium to another, part of it may get reflected in the first medium, and part of it may get transmitted to the second medium. In such a case, the interface of the two mediums can be considered as a boundary that is neither fixed nor free.
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
2.3K