The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 07, 2011
Filed:
Dec. 20, 2007
Chih-kung Lee, Taipei, TW;
Ding-zheng Lin, Taipei, TW;
Tsung-dar Cheng, Taipei, TW;
Chin-kai Chang, Tainan, TW;
Chih-hao Chen, Taichung County, TW;
Chau-shioung Yeh, Taipei, TW;
You-chia Chang, Taichung, TW;
Chih-Kung Lee, Taipei, TW;
Ding-Zheng Lin, Taipei, TW;
Tsung-Dar Cheng, Taipei, TW;
Chin-Kai Chang, Tainan, TW;
Chih-Hao Chen, Taichung County, TW;
Chau-Shioung Yeh, Taipei, TW;
You-Chia Chang, Taichung, TW;
Industrial Technology Research Institute, Hsinchu, TW;
National Taiwan University, Taipei, TW;
Abstract
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.