MEMS-based VCSEL beam steering using replicated polymer diffractive lens
Journal article, 2008

Abstract. This paper describes a fully integrated micro-optical system, in which dynamic angular control of the beam from a VCSEL (vertical cavity surface emitting laser) is realized by laterally moving a collimat┬Čing diffractive lens in the light path. The lens is mounted on a translatable silicon stage, which consists of a frame with an opening for the light to traverse the lens and electro-statically driven comb actuators, by which the lateral movement is achieved. Devices implementing both 1D and 2D scanning have been fabricated and evaluated. Integration of the lens onto the translatable silicon stage is done using a newly developed fabrication process based on hot embossing of an amorphous fluorocarbon polymer. This fabrication process relies on a reversed-order protocol, where the structuring of the optical element precedes the silicon microstructuring. Assembly and packaging of the VCSEL-MOEMS system, using LTCC (low temperature cofired ceramic) technique, is also demonstrated. Optical evaluation of the system and beam steering function shows significant beam deflection for a relatively low driving voltage (~70 V).

Beam steering

Diffractive micro-optics

VCSEL

Replication

MOEMS

Microsystem

Author

Karin Hedsten

Chalmers, Applied Physics, Electronics Material and Systems Laboratory

Jonas Melin

Uppsala University

Jörgen Bengtsson

Chalmers, Microtechnology and Nanoscience (MC2), Photonics

Peter Modh

Chalmers, Microtechnology and Nanoscience (MC2), Nanofabrication Laboratory

David Karlén

Chalmers, Applied Physics, Electronics Material and Systems Laboratory

Björn Löfving

Imego AB - The Institute of Micro and Nanotechnology

Richard Nilsson

Imego AB - The Institute of Micro and Nanotechnology

Henrik Rödjegård

Imego AB - The Institute of Micro and Nanotechnology

Katrin Persson

Imego AB - The Institute of Micro and Nanotechnology

Peter Enoksson

Chalmers, Applied Physics, Electronics Material and Systems Laboratory

Fredrik Nikolajeff

Uppsala University

G. Andersson

Imego AB - The Institute of Micro and Nanotechnology

Sensors and Actuators, A: Physical

0924-4247 (ISSN)

Vol. 142 1 336-345

Subject Categories

Other Electrical Engineering, Electronic Engineering, Information Engineering

DOI

10.1016/j.sna.2006.12.015