Dr. Prem

What is Two-Photon Absorption?

What is Two-Photon Absorption?

Two-photon absorption (TPA) is the simultaneous absorption of two-photons of the same or different wavelenth by a material. In physics two-photon absorption

What is Dip-in Two-photon Lithography ?

Dip-in two-photon lithography (DTPL) system was developed to overcome some limitations of the conventional TPL system (Figure 1). In dip-in two-photon lithography the lens is in direct contact with (dipped into) the

5 mins read

A Castle on a Pencil Lead

This video demonstration of two-photon lithography (laser direct writing) shows the fabrication of a microscopic castle on top a pencil lead. It was produced and shared by the team led by Prof.

1 min read

How Small can we 3D Print?

Current techniques provide 3D printing of structures as small as few nanometers. Main candidates from producing complex 3D structures are two-photon lithography, ion-beam lithography and Atomic force microscopy based lithographic technique. The

2 mins read
Classic Papers about Direct Laser Writing

Classic Papers about Direct Laser Writing

This post will introduce a roll call of classic papers about direct laser writing (DLW) in a chornological order, and talk briefly about their significance. Over the years there have been many

17 mins read
What is Two-Photon Absorption?

What is Two-Photon Absorption?

Two-photon absorption (TPA) is the simultaneous absorption of two-photons of the same or different wavelenth by a material. In physics two-photon absorption is categorized as a third-order nonlinear optical phenomenon. The image on

3 mins read