Nanomaterial synthesis and surface nanostructuring can be simultaneously realized by femtosecond laser ablation in liquids. In each field, there are some targets that are highly desired to be reached. In this paper, we will first summarize the challenging issues and targets desirable to be reached in each field and then present the results achieved in RIKEN which involves some new findings an
Laser ablation has emerged as a novel method to synthesize various nanomaterials.1-3 Currently, most works merely focus on the material synthesis using laser ablation technique with little attention to the relationship between the ablated substrates and the synthesized materials. This work is aimed at filling this gap and giving new insights based on laser ablation of single crystal diamond-cubic (dc) (400) Si in air. Polycrystallization is a ubiquitous phenomenon occurring during laser ablation of Si. The polycrystallization rate of the ablated areas increases with increasing the laser powers, which well explains the polycrystalline instinct of the synthesized nanomaterials. Faster cooling rates of the laser-generated molten Si layers over their nucleation rates result in the surface amorphoization. The molten layers together with the newly formed polycrystalline Si materials will be pushed upward in air by shockwaves to solidify into the amorphous SiOx encapsulated polycrystalline Si composites.
Reference:
1. Zhang, D.; Gökce, B.; Barcikowski, S. Laser Synthesis and Processing of Colloids: Fundamentals and Applications. Chem. Rev. 2017, 117, 3990.
2. Zhang, D.; Liu, J.; Li, P.; Tian, z.; Liang, C. Recent Advances in Surfactant-Free, Surface Charged and Defect-Rich Catalysts Developed by Laser Ablation and Processing in Liquids. ChemNanoMat 2017, DOI:10.1002/cnma.201700079.
3. Zhang, D.; Liu, J.; Liang, C. Perspective on how laser-ablated particles grow in liquids. Sci. China Phys. Mech. Astron. 2017, 60, 074201.
A thermal infrared(MWIR or LWIR) integral imaging(II) system is proposed for acquiring and displaying 3D surface
infrared emission radiance information of a real target. To intuitively analyze infrared integral image quality, we perform
the numerical simulation and reconstruction of thermal integral image based on the modeling of sensor physical effects.
Specifically, the 3D object with thermal infrared radiance texture is first focused into infrared elemental images by
combining the virtual model of infrared microlens array and the response characteristics of detector array. Further, the
displayed thermal elemental images are obtained by simulating main degradation factors including the spatial filtering
blur, sampling effects, and spatial-temporal noise involved in practical infrared sensor. Finally, the thermal infrared 3D
integral image is reconstructed by plane-plane reconstruction technique (PPRT) method based on the degraded elemental
images. Their simulation results are demonstrated and analyzed. To the best of our knowledge, this is the first time to
study thermal infrared II system and implement computational II reconstruction by considering thermal sensor physical
effects.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.