Published: Jan. 1, 2024
Photovoltage 2D mapping of low-temperature GaAs metal-semiconductor-metal micro-structures reveals thermovoltaic and photovoltaic effects with the former being dominant process at high average power for both cw femtosecond-pulse excitations.
Language: Английский
Science, Journal Year: 2023, Volume and Issue: 380(6640), P. 59 - 63
Published: April 6, 2023
Extreme ultraviolet (EUV) radiation is a key technology for material science, attosecond metrology, and lithography. Here, we experimentally demonstrate metasurfaces as superior way to focus EUV light. These devices exploit the fact that holes in silicon membrane have considerably larger refractive index than surrounding efficiently vacuum-guide light with wavelength of ~50 nanometers. This allows transmission phase at nanoscale be controlled by hole diameter. We fabricated an metalens 10-millimeter focal length supports numerical apertures up 0.05 used it ultrashort bursts generated high-harmonic generation down 0.7-micrometer waist. Our approach introduces vast light-shaping possibilities provided dielectric spectral regime lacks materials transmissive optics.
Language: Английский
Citations
94
APL Photonics, Journal Year: 2024, Volume and Issue: 9(2)
Published: Feb. 1, 2024
Since their introduction, all-optical spectroscopy techniques based on attosecond radiation have gained the attention of scientific community because energy and time resolution, combined with an easier experimental implementation respect to other approaches charged particle detection. At present time, almost ten years after first application a solid sample, transient absorption (ATAS) reflection (ATRS) established as powerful tools investigate how electrons can be excited accelerated in matter short light pulses, key requisite establish ultrafast switches quantum electronics overcome current rate data processing information encoding. In this work, we start historical overview pioneering experiments then introduce fundamentals both techniques. We conclude by discussing challenges possible future developments that are expected bring ATAS ATRS beyond state art.
Language: Английский
Citations
8
Nature Communications, Journal Year: 2024, Volume and Issue: 15(1)
Published: Feb. 26, 2024
The need for ever-faster information processing requires exceptionally small devices that operate at frequencies approaching the terahertz and petahertz regimes. For diagnostics of such devices, researchers a spatiotemporal tool surpasses device under test in speed spatial resolution. Consequently, cannot be provided by electronics itself. Here we show how ultrafast electron beam probe with terahertz-compressed pulses can directly sense local electro-magnetic fields electronic femtosecond, micrometre millivolt resolution normal operation conditions. We analyse dynamical response coplanar waveguide circuit reveal impulse response, signal reflections, attenuation dispersion time domain. demonstrated measurement bandwidth reaches 10 THz sensitivity to electric potentials is tens millivolts or -20 dBm. Femtosecond capability integrate our technique into existing electron-beam inspection semiconductor industry makes femtosecond promising research development next-generation unprecedented size.
Language: Английский
Citations
8
ACS Photonics, Journal Year: 2024, Volume and Issue: 11(1), P. 247 - 256
Published: Jan. 3, 2024
The generation of high-order harmonics in bulk solids subjected to intense ultrashort laser pulses has opened up new avenues for research extreme nonlinear optics and light–matter interaction on subcycle time scales. Despite significant advancement over the past decade, a complete understanding involved phenomena is still lacking. High-harmonic currently understood as arising from intraband currents, interband recollision, ionization-related phenomena. As all these mechanisms involve or rely upon laser-driven excitation, we combine measurements angular dependence absorption harmonic crystals demonstrate relation between high-harmonic emission nonlinear, laser-induced ionization solids. An unambiguous correlation found experimentally, which supported by numerical solutions semiconductor Bloch equations an analytical model orientation-dependent rates using maximally localized Wannier functions.
Language: Английский
Citations
6
Nature Reviews Physics, Journal Year: 2024, Volume and Issue: 6(11), P. 648 - 662
Published: Oct. 3, 2024
Citations
5
Laser & Optoelectronics Progress, Journal Year: 2025, Volume and Issue: 62(1), P. 0126001 - 0126001
Published: Jan. 1, 2025
Citations
0
Journal of Vacuum Science & Technology B Nanotechnology and Microelectronics Materials Processing Measurement and Phenomena, Journal Year: 2025, Volume and Issue: 43(2)
Published: Feb. 7, 2025
Nanostructured materials and nanolattices with high porosity can have novel optical mechanical properties that are attractive for nanophotonic devices. One existing challenge is the integration of microstructures be used as waveguides or electrodes on such nanostructures without filling in pores. This study investigates fabrication TiO2 using a stencil mask. In this approach, planarized polymer film while patterned sequential shadow deposition step. Our results demonstrate successful “dog-bone” microstructure 400 μm length, 100 width, 30–560 nm thicknesses nanostructure 390 500 period. The experimental show cracks form microstructures, which attributed to residual stress thermal annealing cycle. A key finding decrease layer becomes thinner, highlighting an important relationship between grain size distribution thickness. stability underlying also plays role, where interconnected architecture mitigated crack formation when compared isolated structures. demonstrated process lead integrated microelectrodes nanolattices, find applications next-generation photonic electronic
Language: Английский
Citations
0
Applied Physics, Journal Year: 2025, Volume and Issue: 15(04), P. 242 - 255
Published: Jan. 1, 2025
Language: Английский
Citations
0
Advanced Optical Materials, Journal Year: 2025, Volume and Issue: unknown
Published: April 26, 2025
Abstract On‐chip electronic devices driven by ultrafast light represent a promising approach to surpass traditional information processing speeds. However, practical implementation has been limited the requirement for material with complex heterostructure and femtosecond lasers high pulse energy, carrier‐envelope phase stability, few‐cycle durations. To address this limitation, an on‐chip logic gate is developed on metallic platform based photothermoelectric effect (PTE) plasma resonance absorption of gold. By manipulating polarization, hot carrier migration controlled, achieving polarization ratio bipolar response. Meanwhile, time‐resolved transient spectroscopy demonstrates that switching time sub‐picosecond scale. The used two picojoule‐level laser pulses as inputs, outputting nanoampere‐level currents controllable polarity. This design provides convenient fabrication process, large‐scale speed computing devices.
Language: Английский
Citations
0
Nature Communications, Journal Year: 2025, Volume and Issue: 16(1)
Published: May 9, 2025
Abstract In the last decade, advancements in attosecond spectroscopy have allowed researchers to study and manipulate electron dynamics condensed matter via ultrafast light fields, offering possibility realise optoelectronic devices. Here, we report generation of light-induced quantum tunnelling currents graphene phototransistors by laser pulses an ambient environment. This effect provides access instantaneous field-driven current, demonstrating a current switching (ON OFF) on ~630 scale (~1.6 petahertz speed). We show tunability enhancement phototransistor conductivity controlling density photoexcited charge carriers at different pump powers. exploited this capability demonstrate various logic gates. The reported approach under conditions is suitable for development optical transistors, lightwave electronics, computers.
Language: Английский
Citations
0