Patent Number: 
Section: claims

1. A method for electron-beam writing to a medium comprising:positioning the medium within an e-beam writing machine so that the medium is supported by a stage and is exposed to an e-beam source; andwriting a pattern to the medium using a plurality of independently-controllable beams of the e-beam source, in which the pattern comprises a plurality of parallel strips, and further in which each of the parallel strips is written using multiple ones of the independently-controllable beams, in which each of the independently-controllable beams comprises a patterned beam with multiple non-independent sub-beams, in which the independently-controllable beams are overlaid with an offset relative to each other and an angular offset with respect to a direction of scanning. 2. The method of claim 1 in which the strips are not separated by stitching. 3. The method of claim 1 in which the independently-controllable beams are overlaid so that a projection of the independently-controllable beams on the medium produces an arrangement wherein adjacent pixels are written by different ones of the independently-controllable beams. 4. The method of claim 1 in which the offset relative to each other is equal to one pixel. 5. The method of claim 1 in which the offset relative to each other is greater than one pixel. 6. The method of claim 1 in which each of the independently-controllable beams comprises a M×M array of the sub-beams, where M is an integer greater than 1. 7. The method of claim 1 in which the independently-controllable beams are applied using at least one of: e-beam deflection and relative movement of the medium to the e-beam source. 8. An electron-beam writing system, the system comprising:a stage upon which a medium may be placed;a writing mechanism to write upon the medium placed upon the stage, the writing mechanism comprising an electron beam source operable to produce N independently-controllable beams, where N is an integer larger than 1; anda computer-based control system operable to:write a pattern upon the medium in a plurality of parallel strips, each of the strips being written using multiple ones of the N independently-controllable beams, in which each of the independently-controllable beams includes an M×M array of sub-beams, the sub-beams not being independently controllable, in which the computer-based control system writes to the medium by overlaying the N independently-controllable beams with an offset relative to each other and an angular offset with respect to a direction of scanning so that a projection of the N independently-controllable beams along a line perpendicular to the direction of scanning has adjacent pixels from different ones of the independently-controllable beams. 9. The system of claim 8 in which the independently-controllable beams are applied using at least one of: e-beam deflection and relative movement of the medium to the electron beam source. 10. A method for electron-beam writing to a medium, the method comprising:positioning an e-beam source to write a plurality of strips onto the medium using N independently-controllable beams; andwriting to each of the strips using multiple ones of the N independently-controllable beams, variations among the respective independently-controllable beams being averaged by writing to each strip using a unique subset of the N independently-controllable beams, in which the independently-controllable beams each comprise a patterned beam with an array of M×M non-independent sub-beams, the independently-controllable beams being overlaid with an offset relative to each other and an angular offset relative to a direction of scanning so that a projection of the independently-controllable beams on the medium has a pattern in which adjacent pixels are from different ones of the independently-controllable beams. 11. The method of claim 10 in which a motion of the independently-controllable beams uses straight-line scanning and wherein, for each of the plurality of strips, the independently-controllable beams are applied simultaneously.