scholarly journals Nanoscale Lamb wave–driven motors in nonliquid environments

2019 ◽  
Vol 5 (3) ◽  
pp. eaau8271 ◽  
Author(s):  
Jinsheng Lu ◽  
Qiang Li ◽  
Cheng-Wei Qiu ◽  
Yu Hong ◽  
Pintu Ghosh ◽  
...  
Keyword(s):  
Lamb Wave ◽  
Laser Scanning ◽  
Outer Space ◽  
Rotation Velocity ◽  
Metal Plate ◽  
Light Pulses ◽  
Dry Adhesion ◽  
All Optical ◽  
Application Potential ◽  
Favorable Configuration

Achieving light-driven motions in nonliquid environments presents formidable challenges, because microsized objects experience strong dry adhesion and intend to be stuck to contact surfaces with great tenacity. Here, in air and vacuum, we show rotary locomotion of a micrometer-sized metal plate with ~30 nm thickness, revolving around a microfiber. This motor is powered by pulsed light guided into the fiber as a coordinated consequence of an optically excited Lamb wave on the plate and favorable configuration of plate-fiber geometry. The motor, actuated by designed light pulses, crawls stepwise with subnanometer locomotion resolution. Furthermore, we can control the rotation velocity and step resolution by varying the repetition rate and pulse power, respectively. A light-actuated micromirror scanning with 0.001° resolution is then demonstrated on the basis of this motor. It offers unprecedented application potential for integrated micro-opto-electromechanical systems, outer-space all-optical precision mechanics and controls, and laser scanning for miniature lidar systems.

Adaptive Data Acquisition for Fast Ultrasonic Imaging Using Laser Induced Phased Arrays

2021 ◽  
Author(s):  
Peter Lukacs ◽  
Theodosia Stratoudaki ◽  
Geo Davis ◽  
Anthony Gachagan
Keyword(s):  
Data Acquisition ◽  
Laser Scanning ◽  
Phased Arrays ◽  
A Priori ◽  
Data Set ◽  
Synthesis Time ◽  
Application Potential ◽  
Time Savings ◽  
Ultrasonic Images ◽  
Acquisition Method

Abstract This study introduces a novel data acquisition method, the Selective Matrix Capture (SMC), that can adapt the array geometry during data acquisition, to the demands of the inspected structure, such as the defects encountered. The adaptive data acquisition method is enabled by the use of Laser Induced Phased Arrays (LIPAs). We have previously demonstrated high-resolution ultrasonic images of the interior of components using Full Matrix Capture (FMC) and the Total Focusing Method (TFM). However, capturing the FMC requires long synthesis time due to signal averaging and mechanical laser scanning, compromising the application potential of LIPAs. Given that most components are defect free, significant time savings can be obtained by only acquiring high-fidelity data when a defect is indicated. The paper presents the Selective Matrix Capture that acquires data more efficiently without a priori knowledge of the location of the defects, while still achieving the superior imaging quality provided by an FMC data set.

scholarly journals All-optical reshaping of light pulses by using χ^(2) media

2003 ◽  
Vol 20 (9) ◽  
pp. 1880 ◽  
Author(s):  
Kuanshou Zhang ◽  
Laurent Longchambon ◽  
Thomas Coudreau ◽  
Claude Fabre
Keyword(s):  
Light Pulses ◽  
All Optical

Low-light-level all-optical switching based on stored light pulses

2008 ◽  
Vol 78 (3) ◽  
Author(s):  
Wei-Hsun Lin ◽  
Wen-Te Liao ◽  
Chang-Yi Wang ◽  
Yen-Feng Lee ◽  
Ite A. Yu
Keyword(s):  
Optical Switching ◽  
Light Level ◽  
Low Light ◽  
Light Pulses ◽  
All Optical ◽  
All Optical Switching

Compression of periodic light pulses using all-optical repetition rate multiplication

2003 ◽  
Vol 217 (1-6) ◽  
pp. 343-349 ◽  
Author(s):  
Naum K. Berger ◽  
Boris Vodonos ◽  
Shimie Atkins ◽  
Vladimir Smulakovsky ◽  
Alexander Bekker ◽  
...  
Keyword(s):  
Repetition Rate ◽  
Light Pulses ◽  
All Optical
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