Article
Chemistry, Multidisciplinary
Kevin Werner, Enam Chowdhury
Summary: The mid-infrared wavelengths provide new possibilities for femtosecond laser-solid interactions, allowing for high-order modifications and sub-surface changes on semiconductors. The extreme sub-wavelength structures formed on a single crystal silicon surface by a 3600 nm MIR femtosecond laser show linear structures with quasi-periodicity of 700 nm aligned parallel to the laser polarization direction. The properties of these structures were studied using various microscopy techniques, indicating the need for new theoretical efforts to explain their formation.
Article
Multidisciplinary Sciences
Reina Miyagawa, Daisuke Kamibayashi, Hirotaka Nakamura, Masaki Hashida, Heishun Zen, Toshihiro Somekawa, Takeshi Matsuoka, Hiroyuki Ogura, Daisuke Sagae, Yusuke Seto, Takahisa Shobu, Aki Tominaga, Osamu Eryu, Norimasa Ozaki
Summary: In this study, the crystallinity of laser-induced periodic surface structures (LIPSS) generated by different lasers was observed and analyzed microscopically and macroscopically. The results showed that LIPSS induced by different lasers exhibit different crystalline states and structural characteristics. This research provides important insights for achieving LIPSS with desired properties and characteristics.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Joerg Schille, Jose R. Chirinos, Xianglei Mao, Lutz Schneider, Matthias Horn, Udo Loeschner, Vassilia Zorba
Summary: This work investigates the interactions between femtosecond filament lasers and matter, as well as the formation of laser-induced periodic surface structures (LIPSS) at a beam-propagation distance of up to 55 m. The study quantifies the periodicity of filament-induced self-organized surface structures and demonstrates that the size of nano-scale surface features increases with ongoing laser filament processing. In addition, periodic ripples start to form in the center of the ablation spot after irradiation with five spatially overlapping pulses. The results also show that the number of irradiating filament pulses per spot area significantly affects the surface texture development, with the period of low spatial frequency LIPSS reducing notably at a high pulse number. The high regularity of the filament-induced ripples is verified through the angle-of-incidence-dependent diffraction of sunlight. This work highlights the potential of long-range femtosecond filamentation for energy delivery at remote distances, with suppressed diffraction and long depth focus, and its applications in biomimetic laser surface engineering and remote sensing.
Article
Chemistry, Physical
Kernius Vilkevicius, Algirdas Selskis, Evaldas Stankevicius
Summary: This study investigates the formation of gold nanostructures (nanobumps, nanocones, and nanojets) on the surface of metal using laser direct writing technique with different laser wavelengths. Experimental results show that shorter wavelength lasers provide a more precise and efficient fabrication process for controlling the properties of the nanostructures, making them highly suitable for practical applications.
APPLIED SURFACE SCIENCE
(2023)
Article
Physics, Fluids & Plasmas
Kazem Ardaneh, Remi Meyer, Mostafa Hassan, Remo Giust, Benoit Morel, Arnaud Couairon, Guy Bonnaud, Francois Courvoisier
Summary: The creation of high-energy-density over-critical plasmas has important applications and this study investigates the relationship between field structure and absorption mechanism with the plasma density transverse profile.
PHYSICS OF PLASMAS
(2022)
Article
Physics, Fluids & Plasmas
Kazem Ardaneh, Ken-Ichi Nishikawa, Remo Giust, Benoit Morel, Pierre-Jean Charpin, Arnaud Couairon, Guy Bonnaud, Francois Courvoisier
Summary: It has been recently found that femtosecond Bessel pulses focused inside dielectrics can induce high aspect ratio over-critical plasmas, resulting in the emission of THz radiation. Through three-dimensional particle-in-cell simulation and analytical derivation, it is shown that the THz radiation is associated with a hot population of electrons trapped in ambipolar electric fields of the double layers.
PHYSICS OF PLASMAS
(2023)
Article
Physics, Fluids & Plasmas
Kazem Ardaneh, Mostafa Hassan, Benoit Morel, Remi Meyer, Remo Giust, Arnaud Couairon, Guy Bonnaud, Francois Courvoisier
Summary: This study explores the characteristics of second-harmonic emission observed during the focusing of a femtosecond Bessel beam inside sapphire. Through experimental and theoretical investigations, the efficiency and polarization of second-harmonic generation are analyzed in relation to plasma parameters, confirming the importance of over-critical plasma inside sapphire.
PHYSICS OF PLASMAS
(2022)
Article
Optics
Haibin Sun, Xiaolong Liu, Li Zhao, Jianxin Jia, Changhui Jiang, Jiamin Xiao, Yuwei Chen, Long Xu, Zhiyong Duan, Peng Rao, Shengli Sun
Summary: This study reveals the mechanism and influencing factors of infrared absorption in hyperdoped silicon through the measurement of optical absorptance and calculations based on coherent potential approximation. This has important implications for the optoelectronic applications of this material.
Article
Engineering, Electrical & Electronic
Chao Li, Ji-Hong Zhao, Yang Yang, Qi-Dai Chen, Zhan-Guo Chen, Hong-Bo Sun
Summary: This paper reports a chromium-hyperdoped black Si material fabricated using femtosecond laser pulses, with high concentration of Cr atoms and sub-bandgap absorptance, resulting in excellent responsivity and millisecond-level response time of the fabricated photodiodes.
IEEE SENSORS JOURNAL
(2021)
Article
Physics, Multidisciplinary
Zhidong Wen, Haiyan Shi, Song Yue, Man Li, Zhe Zhang, Ran Wang, Qi Song, Ziye Xu, Zichen Zhang, Yu Hou
Summary: This study creatively proposes a method of femtosecond laser-induced black silicon assisted with laser plasma shockwave cleaning, which achieves higher, denser, and more uniform microstructures in the preparation of large-scale black silicon. It is beneficial for realizing large-scale preparation of photoelectric devices based on black silicon.
FRONTIERS IN PHYSICS
(2022)
Article
Optics
Wenlong Wang, Wei Lin, Xuewen Chen, Xianchao Guan, Xiaoxiao Wen, Tian Qiao, Xiaoming Wei, Zhongmin Yang
Summary: In this Letter, a high-speed broadband wavelength-swept femtosecond source (WFS) is presented, which utilizes soliton self-frequency shift (SSFS) and intensity-wavelength encoding technologies. The WFS can continuously sweep its optical wavelength from 1055nm to nearly 1300nm at a sweeping rate of 100 kHz. This source, seeded by a femtosecond mode-locked all-fiber laser, holds great potential for applications requiring fast wavelength scanning and high-speed data processing.
Article
Chemistry, Physical
Haiwen Liu, Qi Hu, Haomin Guo, Runmin Wu, Chengyun Zhang
Summary: A novel glaze layer is formed on the wood surface using femtosecond laser, and it is influenced by laser processing parameters. The glaze layer retains the fibrous structure of the wood and creates a unique honeycomb structure to improve water absorption. The glaze layer only exhibits the G band in the Raman spectra, and the intensity of characteristic functional groups is weaker than that of natural wood. The smooth surface morphology and 3D skeletal structure of the glaze layer are characterized by optical microscope and scanning electron microscope. The water contact angle of the glaze layer is larger than that of the natural wood, indicating a change from hydrophilic to hydrophobic properties. The formation of the glaze layer is attributed to the temporary local high-temperature and high-pressure environment during the laser processing, resulting in the combination of resin and mineral in the wood. The formation of the glaze layer opens up new possibilities for the development of functional wood-based micro/nanodevices, such as green electronic products and solar evaporation surfaces.
SURFACES AND INTERFACES
(2023)
Review
Chemistry, Multidisciplinary
Jijil J. J. Nivas, Salvatore Amoruso
Summary: Extensive research has been conducted on laser-induced periodic surface structures (LIPSS), with a focus on sub-wavelength ripples and less on supra-wavelength grooves. This overview discusses recent investigations on the formation of grooves on crystalline silicon by femtosecond laser pulses, including the influence of various experimental parameters and possible mechanisms for groove formation.
Article
Engineering, Electrical & Electronic
Jiawei Fu, Jingkun Cong, Li Cheng, Deren Yang, Xuegong Yu
Summary: Developing a low-cost, room-temperature operated and CMOS compatible near infrared silicon photodetector is crucial for the advancement of all-silicon optoelectronic integrated circuits. In this study, a zinc-hyperdoped silicon-based photodetector with enhanced sub-bandgap photoresponse is presented, showing a wide range of infrared absorption. The Si:Zn photodetector demonstrates high responsivity, making it suitable for various applications due to its low cost, CMOS compatibility, and room-temperature operability.
SEMICONDUCTOR SCIENCE AND TECHNOLOGY
(2022)
Article
Optics
Alka Mehta, Jyoti Rajput, Niti Kant
Summary: This paper proposes a new scheme to efficiently generate THz radiation by interaction of nonrelativistic lasers with plasma, resulting in efficient THz radiation.
