3D Laser Lithography
3D laser lithography is a femto-second laser based direct patterning technique capable of producing true three dimensional (3D) nanostructures.
The minimum feature size for 3D structures reaches below 200 nm, while sub-100 nm resolution has been realized in 2D.
Make and Model
Nanoscribe, Photonic Professional (GT)
Available mode for use
- Mesoscale fabrication of 3Dstructures on ITO substrates/Si wafer with the resist IP-S.
- Nanoscale fabrication of 3D structures on Borosilicate substrate with the resist IPL-780
- Nanoscale fabrication of 3D structures on Fused silica with the resist IP-DIP
- Lateral feature size : 200nm
- Lateral resolution : 500nm
- Max. writing volume : 300um X 300um X 300um
- Mesoscale 3D printing
- High resolution 3D printing
- Real 3D trajectories (Piezo)
Contact Email3dlitho[at] iitb[dot] ac[dot] in
Central Instrumentation Room, Ground Floor,
Bio-Sciences & Bio-Engineering Department,
I.I.T. Bombay, Powai, Mumbai - 400076
Other contact person(s)
- • Saranya Ajesh
Information-IIT Bombay usersInternal Users Registration Details and Form
Information-External users150.7 KB
Registration form-External users108.75 KB
- System laser class: 1 (en 60825-1:2007)
- Internal laser class: 3b (en 60825-1:2007)
- Center wavelength: 780 nm
- Average output power <180 mW
- Peak power: 25 kW
- Pulse duration ≈ 100 fs
- Repetition rate: 80 mHz
Approaches such as e-beam lithography, UV-lithography, focused ion beam lithography etc are not suitable for patterning multimaterial nanostructures and are inherently planar in nature. 3D Laser lithography is a femto-second laser based direct patterning technique capable of producing true three dimensional (3D) nanostructures with high throughput and large scalability. Because of nonlinear interaction between the femto-second laser pulse and the medium, the interaction is confined to the focal volume, allowing precise material modification in three dimensions in the bulk of the sample. This system will allow fabrication of high quality true 3D nano- and micrometer scaled structures of nearly arbitrary shape. The minimum feature size for 3D structures reaches below 200 nm, while sub-100 nm resolution has been realized in 2D.
3D Printing using Two Photon Polymerization (2PP)
Nanoscribe technology for the fabrication of three-dimensional micro- and nanostructures in photo-sensitive materials is based on direct laser writing (DLW): a non-linear two-photon absorption process (2PA; Figure 1). A necessary condition for two photons of near-infrared light being absorbed simultaneously is a sufficiently high light intensity that is provided by a femtosecond pulsed laser beam. Typically, the laser is focused into the resin and two-photon polymerization (2PP) is triggered only in the focal spot volume, where the light intensity exceeds a polymerization threshold. The resin is otherwise transparent to the wavelength of the photons.
The smallest printable 3D volume is termed a voxel, which is analogous to a 2D pixel. Moving the laserfocus along a trajectory in all three dimensions enables printing of structures built from multiple voxelsand printed lines (Figure 2). This technology enables printing of structures with small, medium and large feature sizes in 3D as well 2D patterns.
Currently the 3D lithography system is optimized for the following substrates only:
- Borosilicate substrate of 30mm diameter and 700um thickness.
- ITO substrates of 25 X 25mm and thickness 700um.
- Fused silica substrates of 25 X 25mm and thickness 700um.
- Users have to upload their design in .stl format, along with the online request.
- The maximum writing volume is 300μm x 300μm x 300μm. All programmed coordinates have to lie within this writing volume. If parts of the programmed structure exceed this writing volume a warning message is shown in the message pane of NanoWrite. Please note that DeScribe is not aware of hardware limits.
The 3d lithography system is optimized for the following resists only:
- IP-L 780
Only online registration through the IRCC webpage will be accepted. If the appointment is given but the user cannot come, a mail should be immediately sent to 3dlitho[at] iitb [dot] ac [dot] in to cancel his/her slot.