Frontiers of Optomechanics of Nanocrystals

Topic Information

Dear Colleagues,

The exploration of the materials world at micro- or nanoscale asks for significant manipulation technologies to control nanomaterials in precise and versatile manner. Optical manipulation in regarded as one of the most promising platform due to non-contact interaction, high accuracy, and flexibility in light management. Physically, optical manipulation arises from the optomechanic coupling during the light-matter interaction, which includes direct momentum transfer between photons and nanomaterials and multiple-field coupling to convert optical energy to mechanical energy. The response of nanocrystals to the light-generated force field provides opportunities to trap or actuate the nanocrystals for a variety of applications in functional photonic devices, biosensing and nanomedicine. The present multidisciplinary topic on “Frontiers of Optomechanics of Nanocrystals” will summarize the most recent progress in this field, including but not limited to optical trapping, optical levitation, optical micromachines, optical printing, and optical assembly, as well as their cutting-edge applications. We expect that this multidisciplinary topic will provide new guidance for the design of optomechanic nanosystems for future technical innovation and applications.

Dr. Linhan Lin
Prof. Dr. Hongbao Xin
Topic Editors

Keywords

Participating Journals

Journal Name	Impact Factor	CiteScore	Launched Year	First Decision (median)	APC
Crystals crystals	2.4	4.2	2011	10.8 Days	CHF 2100
Micromachines micromachines	3.0	5.2	2010	17.7 Days	CHF 2600
Nanoenergy Advances nanoenergyadv	-	-	2021	25 Days	CHF 1000

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Published Papers (2 papers)

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All Crystals Micromachines Nanoenergy Advances

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13 pages, 5025 KiB  

Open AccessArticle

Pt-Modified Interfacial Engineering for Enhanced Photocatalytic Performance of 3D Ordered Macroporous TiO₂

by Shunhong Dong, Juan Wu, Lanlan Huang and Hong-En Wang

Crystals 2022, 12(6), 778; https://doi.org/10.3390/cryst12060778 - 27 May 2022

Cited by 7 | Viewed by 1892

Abstract

Narrowing the band gap and increasing the photodegradation efficiency of TiO₂-based photocatalysts are very important for their wide application in environment-related fields such as photocatalytic degradation of toxic pollutants in wastewater. Herein, a three-dimensionally ordered macroporous Pt-loaded TiO₂ photocatalyst (3DOM [...] Read more.

Narrowing the band gap and increasing the photodegradation efficiency of TiO₂-based photocatalysts are very important for their wide application in environment-related fields such as photocatalytic degradation of toxic pollutants in wastewater. Herein, a three-dimensionally ordered macroporous Pt-loaded TiO₂ photocatalyst (3DOM Pt/TiO₂) has been successfully synthesized using a facile colloidal crystal-template method. The resultant composite combines several morphological/structural advantages, including uniform 3D ordered macroporous skeletons, high crystallinity, large porosity and an internal electric field formed at Pt/TiO₂ interfaces. These unique features enable the 3DOM Pt/TiO₂ to possess a large surface for photocatalytic reactions and fast diffusion for mass transfer of reactants as well as efficient suppression of recombination for photogenerated electron-hole pairs in TiO₂. Thus, the 3DOM Pt/TiO₂ exhibits significantly enhanced photocatalytic activity. Typically, 88% of RhB can be degraded over the 3DOM Pt/TiO₂ photocatalyst under visible light irradiation (λ ≥ 420 nm) within 100 min, much higher than that of the commercial TiO₂ nanoparticles (only 37%). The underlying mechanism for the enhanced photocatalytic activity of 3DOM Pt/TiO₂ has been further analyzed based on energy band theory and ascribed to the formation of Schottky-type Pt/TiO₂ junctions. The proposed method herein can provide new references for further improving the photocatalytic efficiency of other photocatalysts via rational structural/morphological engineering. Full article

(This article belongs to the Topic Frontiers of Optomechanics of Nanocrystals)

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12 pages, 10572 KiB  

Open AccessArticle

Multiphoton Absorption Simulation of Sapphire Substrate under the Action of Femtosecond Laser for Larger Density of Pattern-Related Process Windows

by Xintian Cai, Chaoyue Ji, Changkai Li, Zhiqiang Tian, Xuan Wang, Cheng Lei and Sheng Liu

Micromachines 2021, 12(12), 1571; https://doi.org/10.3390/mi12121571 - 17 Dec 2021

Cited by 10 | Viewed by 2711

Abstract

It is essential to develop pattern-related process windows on substrate surface for reducing the dislocation density of wide bandgap semiconductor film growth. For extremely high instantaneous intensity and excellent photon absorption rate, femtosecond lasers are currently being increasingly adopted. However, the mechanism of [...] Read more.

It is essential to develop pattern-related process windows on substrate surface for reducing the dislocation density of wide bandgap semiconductor film growth. For extremely high instantaneous intensity and excellent photon absorption rate, femtosecond lasers are currently being increasingly adopted. However, the mechanism of the femtosecond laser developing pattern-related process windows on the substrate remains to be further revealed. In this paper, a model is established based on the Fokker–Planck equation and the two-temperature model (TTM) equation to simulate the ablation of a sapphire substrate under the action of a femtosecond laser. The transient nonlinear evolutions such as free electron density, absorption coefficient, and electron–lattice temperature are obtained. This paper focuses on simulating the multiphoton absorption of sapphire under femtosecond lasers of different wavelengths. The results show that within the range of 400 to 1030 nm, when the wavelength is large, the number of multiphoton required for ionization is larger, and wider and shallower ablation pits can be obtained. When the wavelength is smaller, the number of multiphoton is smaller, narrower and deeper ablation pits can be obtained. Under the simulation conditions presented in this paper, the minimum ablation pit depth can reach 0.11 μm and the minimum radius can reach 0.6 μm. In the range of 400 to 1030 nm, selecting a laser with a shorter wavelength can achieve pattern-related process windows with a smaller diameter, which is beneficial to increase the density of pattern-related process windows on the substrate surface. The simulation is consistent with existing theories and experimental results, and further reveals the transient nonlinear mechanism of the femtosecond laser developing the pattern-related process windows on the sapphire substrate. Full article

(This article belongs to the Topic Frontiers of Optomechanics of Nanocrystals)

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