76 results about "Interference lithography" patented technology

A method for providing regular line patterns using interference lithography and sidewall patterning techniques is provided according to one embodiment. The method comprising may include producing regularly spaced parallel lines on a template using interference lithography techniques and then depositing sidewalls on the longitudinal sides of the regularly spaced parallel lines using sidewall patterning techniques. Various deposition and etching steps may also be included. The embodiments of the invention may provide regular line patterns with a line density half the interference lithography line density. Various lithography techniques may also be used to crop rounded connecting resulting from the sidewall patterning and/or to alter portions of the line pattern.

The invention relates to a method and a device for producing a coupling grating (5) for a waveguide. The method relies on the technique of interference lithography, whereby an interference pattern on a light-sensitive layer (2) is exposed by superimposing two coherent light beams (3, 4) on said light-sensitive layer (2). Said pattern is then transferred onto the surface of the substrate (1) that lies underneath by subsequent developing and an etching process. The method is characterized in that it uses a shadow mask (6) that is mounted at minimum clearance relative to the surface of the light-sensitive layer (2). By observing said minimum clearance, the Fresnel diffraction images of both light beams (3, 4) are separated on the edge(7). The thickness of the light-sensitive layer (2) is selected in such a way that the superimposition of the Fresnel diffraction pattern of one light beam with the other undisturbed light beam suffices to uncover areas of the substrate (1) during subsequent developing of the layer (2). The method makes it possible to avoid transfer of unwanted diffraction effects on the edge of the shadow mask to the substrate. The method provides a cost-effective solution for the production of large-surface coupling grating matrices.

This invention addresses the scalability problem of periodic “nanostructured” surface treatments such as those formed by interference lithography. A novel but simple method is described that achieves seamless stitching of nanostructure surface textures at the pattern exposure level. The described tiling approach will enable scaling up of coherent nanostructured surfaces to arbitrary area sizes. Such a large form factor nanotechnology will be essential for fabricating large aperture, coherent diffractive elements. Other applications include high performance, antiglare/antireflection and smudge resistant Motheye treatments for display products such as PDA's, laptop computers, large screen TV's, cockpit canopies, instrument panels, missile and targeting domes, and, more recently, “negative-index” surfaces. Although ideal for seamless stitching of nanometer scale patterns, the technology is broadly applicable to any situation where an arbitrarily large area needs to be seamlessly tiled with a smaller base pattern that has periodic overlap able boundaries.

The invention provides a method for preparing a surface-enhanced Raman spectrum substrate. The method comprises the following steps: preparing a substrate layer; forming an adhesion layer on the substrate layer by virtue of evaporation plating or sputtering; forming a metal thin film layer on the adhesion layer by virtue of evaporation plating or sputtering; forming an insulating layer on the metal thin film layer by virtue of evaporation plating or sputtering or chemical vapor deposition or thin film wet-process transfer; forming a metal nano-structure array layer on the insulating layer by virtue of X-ray interference lithography, wherein the X-ray interference lithography comprises photoresist spin-coating; evaporating moisture in a photoresist at 120-180 DEG C; performing X-ray interference exposure; performing development by using a developing solution; curing the developed photoresist; depositing the metal thin film layer on the surface of an ordered nanostructure; and removing excess metals and photoresists. The invention also relates to a surface-enhanced Raman spectrum substrate comprising the substrate layer, the adhesion layer, the metal thin film layer, the insulating layer and the metal nano-structure array layer. The surface-enhanced Raman spectrum substrate prepared by using the method disclosed by the invention has both good sensitivity and stability.

The invention provides surface plasmon (SPP)-based large-area interference lithography technology. In the technology, a dielectric layer with high refractive index is irradiated by two broad-beam light sources, the SPP on the surface of metal is excited in an attenuated total internal reflection coupled mode, and mutual interference exists among the SPP, so that a large-area periodic nanometer graph is formed in a resist; the SPP has the function of reinforcing a near field, so the graph has high contrast; meanwhile, the SPP has the characteristic of short wavelength, so high spatial resolution can be obtained and nanowires exceeding diffraction limit can be realized. Compared with the conventional nanometer lithography technology, the technology has the advantages of low lithography cost, large area exposure, no need of a complex and expensive optical imaging system with high numerical aperture, and wide application prospect in the manufacturing of large-scale integrated circuits and novel optical and electronic nanostructure devices.

The invention relates to a manufacture system of an anti-reflection structure on the surface of a solar cell and a manufacture method thereof, which is characterized in that a plurality of coherent laser beams are combined by a laser interference lithography system to modulate the light intensity distribution in an interference field; the material surface of a photovoltaic cell device is ablated with redistributed laser energy after modulation; and micro or nano-stage dense hole and column relief structures are generated in a large-area range so as to reduce the reflectivity, enhance the light absorption and improve the photovoltaic conversion efficiency. Lacking of external materials, the anti-reflection fine structure generated on the substrate surface by using the method is more stableand durable, and the cycle and the size of the structure can be adjusted by adjusting the incidence angle of the interference lithography system so that the received wavelength has better pertinence and has the advantage of good working band controllability.

In accordance with some aspects of the present disclosure, a maskless interferomeric lithography system for fabricating a three-dimensional (3D) photonic crystal using a multiple two-beam-exposures is disclosed. The system can comprise an illumination system comprising an optical arrangement operable to receive radiation from a radiation source and provide three or more tilted two-beam interference pattern exposures to be combined into a three-dimensional pattern; and a substrate operable to be supported by a substrate table, wherein the substrate comprises a photoresist formed on a top surface of the substrate and operable to receive the three-dimensional pattern and wherein means are provided to adjust the position of the substrate in all six mechanical degrees of freedom.

An interference lithography system is described that is capable of exposing high resolution patterns in photosensitive media and employing yield increasing active stabilization techniques needed in production environments. The inventive device utilizes a division-of-wavefront interference lithography configuration which divides a single large field size optical beam using one or more mirrors, and is actively stabilized with a subsystem employing; a phase modulator operating on each divided wavefront section; a novel feedback apparatus for observing the relative phase shifts between interfering wavefront sections; and a control system for holding the relative phase shifts constant. The present invention also includes; a method for shaping the illumination beam's intensity distribution for more efficient power utilization and greater feature size uniformity; a horizontal substrate loading configuration compatible with robotic handling; an automated pattern pitch calibration for simple, flexible system reconfiguration; a compact clean-room compatible superstructure for increased passive stability in high vibration manufacturing environments; and a method for optimizing the polarization state of the interfering beam sections in a multiple mirror system.

A method and system for acousto-optic FM one-shot exposing imaging interference photo-etching characterizes in using two acousto-optic frequency modulators to move the laser frequency with lambda wave length emitted from a laser to form beams of laser for off-axis illumination light mask on X direction, to form an other beam of laser used in off-axis illuminating the same light mask and using the laser of lambda wavelength to vertically illuminate the light mask. Since three beams of light are incoherent interference beams, images generated by them are laminated incoherently to form a final mask picture, which does not use three laser in different wavelength to expose three times, only needs one shot exposing to finish the imaging photo-etching exposure.

The invention discloses a reflection type beam splitting raster and an interference photolithographic system. The reflection type beam splitting raster comprises a raster groove-shaped area located on a reflection face and a light blocking area located on the periphery of the raster groove-shaped area. The raster groove-shaped area comprises raster structures which are distributed periodically. Each raster structure comprises a groove-shaped reflection face and a non-reflection face. An inclined angle is formed between the groove-shaped reflection face and a raster base face. The reflection type beam splitting raster can realize largest modulation on +-1-level light, and enables reflected beam splitting light to have a highest energy utilization rate. An interference pattern obtained through the reflection type beam splitting raster has good boundary quality, is capable of finishing precise spliced patterns, and enables the large-width interference photolithographic technology to be improved remarkably.

The invention belongs to the technical field of optical instruments and meters, and discloses a laser interference photoetching system, which comprises a laser, a first reflector, a grating beam splitter, a second reflector, a first universal reflector, a first lens, a second universal reflector, a second lens, a beam splitter prism, a control module, an angle measurement module, a third lens anda substrate, wherein the control module comprises a signal processing end, a controller and a driver; the signal processing end is connected with the angle measuring module; the controller is connected with the signal processing end and the driver; and the driver is connected with the first universal reflector and the second universal reflector. A light source emitted by the laser is divided intotwo beams of light through the system and focused on the substrate for exposure; and by adjusting the exposure angle, the manufacturing of the large-area grating with the gradient period is realized.The size of the grating manufactured in a scanning interference photoetching mode is not limited by the size of an exposure light spot, and a large-size gradient period grating can be manufactured.

The invention discloses an interference lithography system with controllable period and direction, wherein the light of the light source is reflected by a first mirror and collimated into parallel beams through a beam expansion filter module, the beams are reflected twice by a second mirror and a third mirror and propagated vertically downward, and then are divided into two coherent beams with equal amplitude by a beam splitter mirror. The reflected beam is reflected three times by the fourth, fifth and sixth mirrors, and the transmitted beam is reflected twice by the seventh and eighth mirrors, and finally converges and interferes on the substrate. A mask plate locate above that substrate is closely attached to the substrate, and the substrate is place on the workpiece table. By moving the positions of the sixth and eighth mirrors laterally and adjusting the angles of the sixth and eighth mirrors, interference of different angles is achieved without changing the height of the substrate in the z direction. The computer control system realizes the horizontal movement and rotation of the sixth and eighth mirrors as well as the precise control of the worktable. The pixel-level array polarization grating with different periods can be prepared by the invention.

The invention discloses a three-beam interference lithography method and a system. The method comprises that: a laser beam is divided into three beams by phase grating and then N times of interference exposure are realized on surface of a workpiece; a dislocation value of two adjacent exposure positions is dI/N, wherein N is an odd number greater than or equal to 3, and dI is a light intensity distribution cycle after the exposure; and the three beams are respectively a first beam, a second beam and a 0 beam with the same complex amplitude. With the three-beam interference lithography method of the invention, a large-size precision multi-level structure can be directly prepared in photoresist with high processing energy efficiency and the components used are easily obtained and have low cost. In addition, by adopting the three-beam interference exposure, the grating and the system have no zero elimination requirement and are easy to prepare.

The invention belongs to the technical field of optical instruments and meters, and discloses an exposure beam phase measurement method in laser interference lithography. The method comprises the steps: separating measuring light from an exposure light beam of laser interference lithography and inputting the measuring light into a laser phase measuring interferometer to carry out phase measurementon the exposure light beam of laser interference lithography; and introducing a reference light beam homologous with the laser interference lithography exposure light beam, inputting the reference light beam into the laser phase measuring interferometer, processing the reference light beam by the laser phase measuring interferometer to form an interference measurement light signal, and performingresolving to obtain the phase of the laser interference lithography exposure light beam. The invention discloses a laser interference lithography system. The system comprises the laser phase measurement interferometer, a controller and a phase modulator; the system adopts the exposure light beam phase measurement method in laser interference lithography, and the laser phase measurement interferometer is used for measuring whether the phase of the exposure light beam drifts or not; the controller controls the phase modulator to carry out phase modulation, the locking of exposure fringe phase drift is completed, and the manufacturing of a high-precision variable-period grating is achieved.

The invention discloses a manufacturing method for increasing the effective photosensitive area of a photoelectric material. The manufacturing method comprises the steps that three laser beams with modulation performance are utilized for carrying out interfering and photoetching on the surface of a host material or the photosensitive material, multi-periodicity micro-nano composite structures in different shapes and of different structures are obtained and manufactured through the mode of multi-angle overlapping exposure or movable distance overlapping exposure, multiple laser beams with the modulation performance can be utilized for carrying out interfering and photoetching on the surfaces of the materials, the multi-periodicity micro-nano composite structures can be directly manufactured, and the three-dimensional effective photosensitive area is increased in a two-dimensional unit plane .

By means of an RIE etch process for silicon (3), a pin-type structure (4,4a) without crystal defects is formed with high aspect ratio and with nano dimensions on the surface of silicon wafers without any additional patterning measures (e-beam, interference lithography, and the like) by selecting the gas components of the etch plasma in self-organization wherein, among others, a broadband antireflective behaviour is obtained that may be applicable in many fields.

The invention provides a stepping queuing interference lithography method and a corresponding apparatus used for making cyclical patterns. At least two homology beams of special shapes are controlled to be projected onto a base material to be exposed so as to form interference fringes of a special zone size. Then the positions of the base material to be exposed or the two homology beams of special shapes are controlled through the stepping movement of times so as to form a preset pattern in a large area on the base material to be exposed. The method of the invention can shorten the optical transmission path and the exposure time so as to further reduce the generation of lithography process defects and increase the defect-free rate of the process.

A mixed lithographic system comprises a light source, a beam shaper, a light field modulator, a mirror, an imaging optical system and a phase element, wherein the beam shaper is used for shaping beams emitted by the light source; the light field modulator is used for generating graphic light from the shaped beams; the imaging optical system and the mirror are used for transmitting a light field to the surface of a to-be-exposed lithographic piece to realize direct writing lithography; the phase element is used for forming an interference exposure field on the surface of the lithographic piece to realize interference lithography. The mixed lithographic system has direct writing lithography and interference lithography functions, can perform mixed lithography, increases the nano-lithography efficiency and has great significance in promoting application of micro-nano structure related devices and materials. The invention further relates to a mixed lithographic method.