In situ study of thermal deformation of metal resistive heater on silicon nitride membrane by digital holographic microscopy

2012 ◽  
Author(s):  
Yiu Wai Lai ◽  
Joshua E.-Y. Lee
Keyword(s):  
Silicon Nitride ◽  
Thermal Deformation ◽  
Digital Holographic Microscopy ◽  
In Situ Study ◽  
Silicon Nitride Membrane ◽  
Resistive Heater ◽  
Holographic Microscopy

scholarly journals Ionic Species Affect the Self-Propulsion of Urease-Powered Micromotors

Research ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-14
Author(s):  
Xavier Arqué ◽  
Xavier Andrés ◽  
Rafael Mestre ◽  
Bernard Ciraulo ◽  
Jaime Ortega Arroyo ◽  
...  
Keyword(s):  
Biological Fluids ◽  
Ionic Species ◽  
The Self ◽  
Digital Holographic Microscopy ◽  
Future Application ◽  
Methoxypolyethylene Glycol ◽  
Negative Effect ◽  
The Media ◽  
Holographic Microscopy

Enzyme-powered motors self-propel through the catalysis of in situ bioavailable fuels, which makes them excellent candidates for biomedical applications. However, fundamental issues like their motion in biological fluids and the understanding of the propulsion mechanism are critical aspects to be tackled before a future application in biomedicine. Herein, we investigated the physicochemical effects of ionic species on the self-propulsion of urease-powered micromotors. Results showed that the presence of PBS, NaOH, NaCl, and HEPES reduced self-propulsion of urease-powered micromotors pointing towards ion-dependent mechanisms of motion. We studied the 3D motion of urease micromotors using digital holographic microscopy to rule out any motor-surface interaction as the cause of motion decay when salts are present in the media. In order to protect and minimize the negative effect of ionic species on micromotors’ performance, we coated the motors with methoxypolyethylene glycol amine (mPEG) showing higher speed compared to noncoated motors at intermediate ionic concentrations. These results provide new insights into the mechanism of urease-powered micromotors, study the effect of ionic media, and contribute with potential solutions to mitigate the reduction of mobility of enzyme-powered micromotors.

scholarly journals In situ nanoscale observations of gypsum dissolution by digital holographic microscopy

2017 ◽  
Vol 460 ◽  
pp. 25-36 ◽  
Author(s):  
Pan Feng ◽  
Alexander S. Brand ◽  
Lei Chen ◽  
Jeffrey W. Bullard
Keyword(s):  
Digital Holographic Microscopy ◽  
Gypsum Dissolution ◽  
Holographic Microscopy

Performance and Reliability of a MEMS-based tunable optical filter operating in the 1565 nm-1525 nm wavelength range

2002 ◽  
Vol 722 ◽  
Author(s):  
T. S. Sriram ◽  
B. Strauss ◽  
S. Pappas ◽  
A. Baliga ◽  
A. Jean ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Line Width ◽  
Insertion Loss ◽  
Optical Filter ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Reliability Testing ◽  
Silicon Nitride Membrane ◽  
Tunable Optical Filter ◽  
Extensive Performance

AbstractThis paper describes the results of extensive performance and reliability characterization of a silicon-based surface micro-machined tunable optical filter. The device comprises a high-finesse Fabry-Perot etalon with one flat and one curved dielectric mirror. The curved mirror is mounted on an electrostatically actuated silicon nitride membrane tethered to the substrate using silicon nitride posts. A voltage applied to the membrane allows the device to be tuned by adjusting the length of the cavity. The device is coupled optically to an input and an output single mode fiber inside a hermetic package. Extensive performance characterization (over operating temperature range) was performed on the packaged device. Parameters characterized included tuning characteristics, insertion loss, filter line-width and side mode suppression ratio. Reliability testing was performed by subjecting the MEMS structure to a very large number of actuations at an elevated temperature both inside the package and on a test board. The MEMS structure was found to be extremely robust, running trillions of actuations without failures. Package level reliability testing conforming to Telcordia standards indicated that key device parameters including insertion loss, filter line-width and tuning characteristics did not change measurably over the duration of the test.

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