Industrial Technology Research Institute

National Taiwan University

Chau-Shioung Yeh

Chih-Hao Chen

Chih-Kung Lee

Ding-Zheng Lin

Tsung-Dar Cheng

Chin-Kai Chang

You-Chia Chang

A micro optical head is provided, which provides sub-wavelength focusing spot and very long depth of focus. The optical head includes a transparent substrate, an opaque film, and at least one sub-wavelength annular channel. After coherent light transmits the transparent substrate supporting the optical head and passes through the appropriately designed sub-wavelength annular channel, the transmitted light can overcome the diffraction limit, and the transmission energy is improved efficiently. The transmitted light converges after a certain distance behind the optical head and forms a sub-wavelength-scale beam that maintains a very long distance without divergence.

Optical head

Growing community of inventors

Taipei, Taiwan

Chau-Shioung Yeh