Title :
Compact variable-focusing microlens with integrated thermal actuator and sensor
Author :
Wang, Weisong ; Fang, Ji ; Varahramyan, Kody
Author_Institution :
Sherman Fairchild Lab. for Solid-state Studies, Lehigh Univ., Bethlehem, PA, USA
Abstract :
An integrated variable-focusing microlens chip with thermal actuator and sensor, which is capable of adjusting its focal length over a wide range, is reported. The packaged microlens chip consists of a flexible polymer lens, a thermal actuator, and a sensor. The focal length change is controlled by varying the voltage applied to the thermal actuator and without any mechanical moving parts. The focal length varies from 9.197 to 2.619 mm, which corresponds to the change of numerical aperture from 0.146 to 0.448. Potential applications include the camera phone, surveillance camera, disc recording systems, collimator, sensing systems, confocal imaging systems, and optical communication.
Keywords :
integrated optics; microactuators; microlenses; microsensors; optical focusing; optical polymers; temperature sensors; camera phone; collimator; compact microlens; confocal imaging systems; disc recording systems; flexible polymer lens; focal length; integrated actuator; microlens chip; numerical aperture; optical communication; packaged chip; sensing systems; surveillance camera; thermal actuator; thermal sensor; variable-focusing microlens; Actuators; Cameras; Lenses; Mechanical sensors; Mechanical variables control; Microoptics; Packaging; Polymers; Thermal lensing; Thermal sensors; Thermal actuator and sensor; variable-focusing microlens; wide-angle lens;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2005.859129
