Abstract:
A microwave heating device includes a variable frequency microwave power supply, a waveguide launcher, and a fixture to contain a material to be heated, with the fixture located directly adjacent to the end of the launcher. All heating occurs in the near-field region, i.e., no cavity modes or standing waves are established within the fixture. This condition may be insured by keeping the thickness of the fixture or workpiece under one wavelength (at all microwave frequencies being used). The launcher is preferably a horn configured to spread the microwave power laterally over a selected area while maintaining a single propagating mode. The invention may be used to enhance catalytic reactions for research and other purposes. Alternatively, the invention may be configured to perform spot curing or repair operations involving adhesives and composites.
Abstract:
The invention relates to a facility (1) for microwave treatment of a load, including: at least one application device (30); at least one solid-state generator (4) in the field of microwaves, connected to at least one application device by a means for guiding (5) the electromagnetic wave; at least one frequency adjustment system (40) designed for adjusting the frequency of the wave produced by the corresponding generator (4); a measurement system (31) for the or each application device (30), designed for measuring the power reflected PR(i) by the application device (30); an automated control means (6) connected to each frequency adjustment system (40) and to each measurement system (31) in order to control the adjustment of the frequency f(i) of the electromagnetic wave according to the reflected power, in order to adjust the reflected power PR(i) and/or to adjust the transmitted power PT(i).
Abstract:
A microwave plasma reactor for manufacturing synthetic diamond material via chemical vapour deposition, the microwave plasma reactor comprising: a plasma chamber defining a resonant cavity for supporting a primary microwave resonance mode having a primary microwave resonance mode frequency f; a plurality of microwave sources coupled to the plasma chamber for generating and feeding microwaves having a total microwave power Pτ into the plasma chamber; a gas flow system for feeding process gases into the plasma chamber and removing them therefrom; and a substrate holder disposed in the plasma chamber and comprising a supporting surface for supporting a substrate on which the synthetic diamond material is to be deposited in use, wherein the plurality of microwave sources are configured to couple at least 30% of the total microwave power Pτ into the plasma chamber in the primary microwave resonance mode frequency f, and wherein at least some of the plurality of microwave sources are solid state microwave sources.
Abstract:
A plasma processing apparatus includes a processing chamber which plasma-processes a sample, a first high-frequency power supply which supplies first high-frequency power for plasma generation to the processing chamber, a second high-frequency power supply which supplies second high-frequency power to a sample stage on which the sample is placed and a pulse generation device which generate first pulses for time-modulating the first high-frequency power and second pulses for time-modulating the second high-frequency power. The pulse generation device includes a control device which controls the first and second pulses so that frequency of the first pulses is higher than frequency of the second pulses and the on-period of the second pulse is contained in the on-period of the first pulse.
Abstract:
A microwave processing apparatus includes a processing chamber which accommodates an object to be processed, and a microwave introducing unit which has at least one microwave source to generate a microwave used to process the object and introduces the microwave into the processing chamber. The microwave processing apparatus further includes a control unit which controls the microwave introducing unit. Furthermore, the control unit changes a frequency of the microwave during a state of processing the object.
Abstract:
Plasma-assisted methods and apparatus that use multiple radiation sources are provided. In one embodiment, a plasma is ignited by subjecting a gas in a radiation cavity to electromagnetic radiation having a frequency less than about 333 GHz in the presence of a plasma catalyst, which may be passive or active. A controller can be used to delay activation of one radiation source with respect to another radiation source.
Abstract:
A method for depositing a conformal dielectric layer employing a dep-etch technique features selectively decreasing the deposition gas present in a process chamber where a substrate to be covered by the conformal dielectric layer is disposed. By selectively decreasing the deposition gas present in the process chamber, the concentration of a sputtering gas, from which a plasma is formed, in the process chamber is increased. It is preferred that the flow of deposition gases be periodically terminated so as to provide a sputtering gas concentration approaching 100%. In this fashion, the etch rate of a conformal dielectric layer having adequate gap-filling characteristics may be greatly increased, while allowing an increase in the deposition rate of the same.
Abstract:
A plasma processing apparatus includes a processing vessel; a carrier wave group generating unit configured to generate a carrier wave group including multiple carrier waves having different frequencies belonging to a preset frequency band centered on a predetermined center frequency; a plasma generating unit configured to generate plasma by using the carrier wave group; a spectrum detecting unit configured to detect a progressive wave spectrum and a reflection wave spectrum of the carrier wave group; and a control unit configured to calculate, by using the progressive wave spectrum and the reflection wave spectrum, an absorption power which is a power of the carrier wave group absorbed into the plasma, and configured to adjust a parameter, which varies a minimum value of the reflection wave spectrum and a frequency corresponding to the minimum value, such that the absorption power becomes equal to or larger than a threshold value.
Abstract:
A plasma processing apparatus includes a chamber; a mounting table configured to mount thereon a target object in the chamber; a plasma source configured to introduce microwaves into the chamber through a ceiling wall of the chamber and generate a surface wave plasma in the chamber; a first gas introduction unit configured to introduce a first gas into the chamber from the ceiling wall; and a second gas introduction unit configured to introduce a second gas into the chamber from a predetermined height position between the ceiling wall and the mounting table. The second gas introduction unit has a plurality of nozzles extending from the ceiling wall toward the mounting table and arranged on a same circumference at a regular interval. Each of the nozzles discharges the second gas toward a nozzle adjacent thereto.
Abstract:
In the plasma etching method, a sample is placed on a stage in a chamber. A first gas is introduced into the chamber. Electric field is supplied within the chamber to plasma is generated from the first gas. A first RF power of a first frequency, which is for generating a bias voltage in the sample for etching the sample with radicals which are generated in the plasma while the plasma is generated, is supplied to the stage. A second gas is introduced from a position in outer periphery of a surface of the stage, on which the sample is placed. A second RF power of a second frequency higher than the first frequency and capable of generating plasma from the second gas above the stage that allows radicals generated in the plasma generated from the second gas to be supplied in the outer periphery, is supplied to the stage.