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3D micro/nano fabrication:
Two Photon Polymerization Lithography
Two photon polymerization (TPP) lithography allows to fabricate three dimensional (3D) polymer structures with the feature size of sub-100 nm. In conventional TPP lithography, near-infrared femtosecond pulsed laser is focused onto UV-curable resin, and the laser light photo-polymerizes a nanometric volume of the resin in the focus spot due to two photon absorption (See right schematic image). Because two photon absorption occurs only in the vicinity of the focus spot, 3D fabrication with sub-diffraction limit resolution is achieved by scanning the focus spot three dimensionally.
Since the first demonstration of TPP lithography in 1997, various micro structures have been fabricated. As an impressive example, in 2001, a micro bull was fabricated (See right images). This is recorded as the world smallest laser sculptures in Guinness book. The size of the bull is 1/10 of a human hair, which is comparable to the size of a red blood cell.
Schematic setup for
TPP lithography
world smallest
laser sculptures
8 µm long micro bull; Guinness record
S. Kawata et al., Nature, 412, 697 (2001)
[Paper]
Carbon nanomaterials
Single Wall Carbon Nanotubes (SWCNTs) :
SWCNTs are quasi-one dimensional carbon nanomaterials that consists of a rolled-up single layer graphene forming into hollow cylinder shape, of which the typical diameter and the length are ~1 nm and ~1000 nm, respectively.
SWCNTs exhibit remarkable mechanical, electrical, thermal, and optical properties. Their Young's moduli and the strengths are ~1 TPa and ~6 GPa. (As a reference, Young's modulus and strength of steel are ~200 GPa and ~400 MPa, respectively).
In addition to this, SWCNTs exhibit intrinsic optical properties depending on their chiralities.
(this page is in process)
Graphene FET Biosensors
SEM image of SWCNTs
Other interests
- Plasmonics
- Optics & Photonics
- Microscopy
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