scholarly journals Rewritable color nanoprints in antimony trisulfide films

2020 ◽  
Vol 6 (51) ◽  
pp. eabb7171
Author(s):  
Hailong Liu ◽  
Weiling Dong ◽  
Hao Wang ◽  
Li Lu ◽  
Qifeng Ruan ◽  
...  
Keyword(s):  
Optical Properties ◽  
High Speed ◽  
Visible Spectrum ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Wide Range ◽  
Amorphous States ◽  
Multiple Switching ◽  
Rapid Switching ◽  
20 Nm

Materials that exhibit large and rapid switching of their optical properties in the visible spectrum hold the key to color-changing devices. Antimony trisulfide (Sb2S3) is a chalcogenide material that exhibits large refractive index changes of ~1 between crystalline and amorphous states. However, little is known about its ability to endure multiple switching cycles, its capacity for recording high-resolution patterns, nor the optical properties of the crystallized state. Unexpectedly, we show that crystalline Sb2S3 films that are just 20 nm thick can produce substantial birefringent phase retardation. We also report a high-speed rewritable patterning approach at subdiffraction resolutions (>40,000 dpi) using 780-nm femtosecond laser pulses. Partial reamorphization is demonstrated and then used to write and erase multiple microscale color images with a wide range of colors over a ~120-nm band in the visible spectrum. These solid-state, rapid-switching, and ultrahigh-resolution color-changing devices could find applications in nonvolatile ultrathin displays.

scholarly journals Laser-assisted fabrication of gold nanoparticle-composed structures embedded in borosilicate glass

2017 ◽  
Vol 8 ◽  
pp. 2454-2463 ◽  
Author(s):  
Nikolay Nedyalkov ◽  
Mihaela Koleva ◽  
Nadya Stankova ◽  
Rosen Nikov ◽  
Mitsuhiro Terakawa ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Optical Properties ◽  
Femtosecond Laser ◽  
Borosilicate Glass ◽  
Glass Sample ◽  
Defect Formation ◽  
Laser Pulses ◽  
Femtosecond Laser Irradiation ◽  
Nanosecond Pulses ◽  
Wide Range

We present results on laser-assisted formation of two- and three-dimensional structures comprised of gold nanoparticles in glass. The sample material was gold-ion-doped borosilicate glass prepared by conventional melt quenching. The nanoparticle growth technique consisted of two steps – laser-induced defect formation and annealing. The first step was realized by irradiating the glass by nanosecond and femtosecond laser pulses over a wide range of fluences and number of applied pulses. The irradiation by nanosecond laser pulses (emitted by a Nd:YAG laser system) induced defect formation, expressed by brown coloration of the glass sample, only at a wavelength of 266 nm. At 355, 532 and 1064 nm, no coloration of the sample was observed. The femtosecond laser irradiation at 800 nm also induced defects, again observed as brown coloration. The absorbance spectra indicated that this coloration was related to the formation of oxygen deficiency defects. After annealing, the color of the irradiated areas changed to pink, with a corresponding well-defined peak in the absorbance spectrum. We relate this effect to the formation of gold nanoparticles with optical properties defined by plasmon excitation. Their presence was confirmed by high-resolution TEM analysis. No nanoparticle formation was observed in the samples irradiated by nanosecond pulses at 355, 532 and 1064 nm. The optical properties of the irradiated areas were found to depend on the laser processing parameters; these properties were studied based on Mie theory, which was also used to correlate the experimental optical spectra and the characteristics of the nanoparticles formed. We also discuss the influence of the processing conditions on the characteristics of the particles formed and the mechanism of their formation and demonstrate the fabrication of structures composed of nanoparticles inside the glass sample. This technique can be used for the preparation of 3D nanoparticle systems embedded in transparent materials with potential applications in the design of new optical components, such as metamaterials and in plasmonics.

scholarly journals Large ultrafast-modulated Voigt effect in noncollinear antiferromagnet Mn3Sn

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
H. C. Zhao ◽  
H. Xia ◽  
S. Hu ◽  
Y. Y. Lv ◽  
Z. R. Zhao ◽  
...  
Keyword(s):  
High Speed ◽  
Linear Dichroism ◽  
Laser Pulses ◽  
Time Resolved ◽  
Spin Configuration ◽  
Ultrafast Laser Pulses ◽  
Spintronic Devices ◽  
Wide Range ◽  
Kerr Angle ◽  
Increasing Temperature

AbstractThe time-resolved magneto-optical (MO) Voigt effect can be utilized to study the Néel order dynamics in antiferromagnetic (AFM) materials, but it has been limited for collinear AFM spin configuration. Here, we have demonstrated that in Mn3Sn with an inverse triangular spin structure, the quench of AFM order by ultrafast laser pulses can result in a large Voigt effect modulation. The modulated Voigt angle is significantly larger than the polarization rotation due to the crystal-structure related linear dichroism effect and the modulated MO Kerr angle arising from the ferroic ordering of cluster magnetic octupole. The AFM order quench time shows negligible change with increasing temperature approaching the Néel temperature (TN), in markedly contrast with the pronounced slowing-down demagnetization typically observed in conventional magnetic materials. This atypical behavior can be explained by the influence of weakened Dzyaloshinskii–Moriya interaction rather than the smaller exchange splitting on the diminished AFM order near TN. The temperature-insensitive ultrafast spin manipulation can pave the way for high-speed spintronic devices either working at a wide range of temperature or demanding spin switching near TN.

High-speed microparticle isolation unlimited by Poisson statistics

Lab on a Chip ◽  
2019 ◽  
Vol 19 (16) ◽  
pp. 2669-2677 ◽  
Author(s):  
Takanori Iino ◽  
Kazunori Okano ◽  
Sang Wook Lee ◽  
Takeshi Yamakawa ◽  
Hiroki Hagihara ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
High Speed ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Poisson Statistics ◽  
On Chip ◽  
Fundamental Limitation

We demonstrate an on-chip microparticle sorter with an ultrashort switching window using femtosecond laser pulses to overcome the fundamental limitation of the sorting performance described by Poisson statistics.

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