In this paper, we propose a multi-channel imaging system, which combines the principles of an insect’s compound eye and optical zoom. We use the distance between two aspherical lenses to achieve zoom effect. In order to shrink the thickness of the system, we use the multi-channel structure which consists of curved micolens array. With this architecture, we can achieve the same effect like lens group. Each partial image passes through each channel separately and is stitched together at the image sensor. In our design, the thickness is 6.57 mm (wide), 6.25 mm (mid), 6.4 mm (tele) and the effective focal length is 2.2 mm( wide), 2.97 mm (mid), 4.04 mm (tele). Zoom ratio is close to 2 times. The size of image sensor is 6 mm in diameter. Due to the advance in microlens fabrication of microlens, this design has the potential to bed used inside mobile phone camera in future.
We presents a nanorods AlN films on sapphire substrate deposited at oblique-angle by a radio-frequency reactive
magnetron sputtering. A nanorods AlN layer was employed as a buffer layer for a GaN-based LEDs to improve
optoelectronic characteristics of LEDs. The diameter of the nanorods AlN buffer layer is in the range of 30-50 nm.
Typical current-voltage characteristics of the GaN-based LEDs with a nanorods AlN buffer layer have a forward-bias
voltage of 3.1 V at an injection current of 20 mA. The output intensity of LEDs initially increases linearly as the
injection current increases from 10 mA to 150 mA. The light output power of the GaN-based LED with a nanoporous
AlN layer was about 31% higher than that of a GaN-based LED without a nanoporous AlN layer at an injection current
of 250 mA.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.