Plasma synthetic jet actuators are widely used in active flow control of high-speed flow field due to their advantages such as no need for external gas source, wide operating frequency band and great intensity of jet. In this paper, the chemical composition, electron temperature and electron density of the plasma jet of a designed synthetic actuator were experimentally studied by using the diagnosis method of emission spectrum of plasma. It is obtained that there are N atoms, N+ ions, Ar atoms, Ar+ ions, C atoms, O atoms, H atoms in the jet. The maximum of the average electron temperature is 5248.8K. With the increase of capacitance of the capacitor, the electron temperature of plasma increases. With the increase of the distance between the anode and the cathode, the electron temperature of plasma decreases. The impact of the distance between the anode and the cathode of the actuator on the electron temperature is greater than that of the discharge power of the actuator. The maximum plasma density was 5.47e23m-3. The plasma density increases with the increasing capacitance, and the plasma density first increases and then decreases with the increase of the distance between the anode and the cathode. In this experiment, the optimal discharge condition is the spacing between anode and cathode being 1.9mm and the capacitance being 0.48uF.
There is acting force that light has on any substances, but the force is too weak to be sensed. While the momentum transfer between light and substance can be greatly improved within nanoscales. Scientists have successfully captured and transported micro-particles by using focusing light in liquid state, which is called optical tweezers. However, this approach needs to be processed with removable powerful focal source and meanwhile in a state of liquid. These requirements seriously restrict its development from optical tweezers to optical propeller. This paper proposes a new method: to produce localized surface plasmons enhancement by asymmetric nanostructures so that a gradient optical field whose intensity is 70 times higher than that of incident light is formed on a nano orbit with a length of 200nm. The strong gradient force makes it possible for the small particles laid on nanostructure to get strong momentum at a certain direction without strong light sources, which breaks through the near field gravitation to move. Meanwhile, the nanostructure can be expanded into multistage accelerating structure, and expanded into an array, thus providing a plane thrust and forming an optical propeller in real sense. At last, electron beam lithography (EBL) is employed to prepare structures with only tens of nanometers in size. A series of better preparation technics are concluded to get samples with good shapes, which provides technical guarantee for the application of nano optical propeller in the future.
We propose a hybrid hyperlens–superlens structure to achieve demagnifying nanolithography. It consists of a core of planar superlens and a shell of cylinder hyperlens. In the nanolithography process, the shell of the cylinder hyperlens could demagnify the mask patterns to the interior cylinder interface, and then the core of the planar superlens transmits the demagnified patterns to the planar output photoresist layer. The performance of this hybrid hyperlens–superlens structure is analyzed for different periods and spacing of mask and demagnification factors. The numerical simulation results agree well with the theory. It is demonstrated that the hybrid structure could be used as a superresolution device for plane demagnifying nanolithography.
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.