Difference between revisions of "Multi-photon lithography"
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| − | '' | + | ''Written by Grant England AP225, Fall 2011'' |
| + | ==Introduction== | ||
[[Image:mpl2.jpg|thumb|400px| Diagram of fundamentals of multiphoton lithography (Maruo, S. and Fourkas, J. (2008), Recent progress in multiphoton microfabrication. Laser & Photonics Reviews, 2: 100–111. doi: 10.1002/lpor.200710039)]] | [[Image:mpl2.jpg|thumb|400px| Diagram of fundamentals of multiphoton lithography (Maruo, S. and Fourkas, J. (2008), Recent progress in multiphoton microfabrication. Laser & Photonics Reviews, 2: 100–111. doi: 10.1002/lpor.200710039)]] | ||
| − | Multiphoton lithography involves any process which requires more than one photon for photochemical activation. Since the reaction (usually [[photopolymerization]] requires more than one photon to be present in the same location in order for it to occur, the probability of this occurring is only large enough near the focal point of a scanning laser beam which is used to three-dimensionally write the material. Also, for this to happen at an arbitrary volume in the photoresist, the material must be optically transparent to the laser light used for illumination. | + | Multiphoton lithography involves any process which requires more than one photon for photochemical activation. Since the reaction (usually [[photopolymerization]] requires more than one photon to be present in the same location in order for it to occur, the probability of this occurring is only large enough near the focal point of a scanning [[laser]] beam which is used to three-dimensionally write the material. Also, for this to happen at an arbitrary volume in the photoresist, the material must be optically transparent to the laser light used for illumination. |
The schematic on the right shows the principles of multiphoton lithography where the material is transparent at <math>f=\nu</math>, but absorbing at <math>f=\frac{\nu}{2}</math>. | The schematic on the right shows the principles of multiphoton lithography where the material is transparent at <math>f=\nu</math>, but absorbing at <math>f=\frac{\nu}{2}</math>. | ||
| − | Methods for large area patterning using multiphoton lithography have been developed by using conformal phase masks [http://rogers.matse.illinois.edu/files/2006/optexpr2photon.pdf], but these are currently limited to periodic structures such as 3D [[Photonic crystal]]s, and cannot produce structures with arbitrary geometries. | + | ==Large Area Patterning Using Multiphoton Lithography== |
| + | Methods for large area patterning using multiphoton lithography have been developed by using conformal phase masks [http://rogers.matse.illinois.edu/files/2006/optexpr2photon.pdf], but these are currently limited to periodic structures such as 3D [[Photonic crystal]]s, and cannot produce structures with arbitrary geometries, such as those shown in the figure. | ||
[[Image:mpl.jpg|300px|thumb| Example structures which can be created using multiphoton lithography (Maruo, S. and Fourkas, J. (2008), Recent progress in multiphoton microfabrication. Laser & Photonics Reviews, 2: 100–111. doi: 10.1002/lpor.200710039)]] | [[Image:mpl.jpg|300px|thumb| Example structures which can be created using multiphoton lithography (Maruo, S. and Fourkas, J. (2008), Recent progress in multiphoton microfabrication. Laser & Photonics Reviews, 2: 100–111. doi: 10.1002/lpor.200710039)]] | ||
| − | + | ==See also== | |
| + | |||
| + | [http://en.wikipedia.org/wiki/Multiphoton_lithography Wikipedia stub] | ||
== Keyword in references: == | == Keyword in references: == | ||
[[Direct Writing and Actuation of Three-Dimensionally Patterned Hydrogel Pads on Micropillar Supports]] | [[Direct Writing and Actuation of Three-Dimensionally Patterned Hydrogel Pads on Micropillar Supports]] | ||
Latest revision as of 20:55, 8 December 2011
Written by Grant England AP225, Fall 2011
Contents
Introduction
Multiphoton lithography involves any process which requires more than one photon for photochemical activation. Since the reaction (usually photopolymerization requires more than one photon to be present in the same location in order for it to occur, the probability of this occurring is only large enough near the focal point of a scanning laser beam which is used to three-dimensionally write the material. Also, for this to happen at an arbitrary volume in the photoresist, the material must be optically transparent to the laser light used for illumination. The schematic on the right shows the principles of multiphoton lithography where the material is transparent at <math>f=\nu</math>, but absorbing at <math>f=\frac{\nu}{2}</math>.
Large Area Patterning Using Multiphoton Lithography
Methods for large area patterning using multiphoton lithography have been developed by using conformal phase masks [1], but these are currently limited to periodic structures such as 3D Photonic crystals, and cannot produce structures with arbitrary geometries, such as those shown in the figure.
See also
Keyword in references:
Direct Writing and Actuation of Three-Dimensionally Patterned Hydrogel Pads on Micropillar Supports
