In this letter, we have proposed and demonstrated, for the first time, the application of low-voltage magnetic actuation to a tunable optical filter to achieve a wide linear tuning range. We have fabricated and tested three different types of spring structures: straight, corrugated, and meander types to optimize the proposed magnetic actuation for high linearity and low power consumption. From the fabricated actuator, we have acquired a wide linear tuning range over 200 nm in wavelength, which is the widest ever reported to the best of our knowledge. The fabricated tunable filter has demonstrated a maximum static power consumption of less than 25 μW for wavelength tuning up to 200 nm with an external magnetic field of 0.28 T.
Bibliographical noteFunding Information:
Manuscript received April 6, 2004; revised May 27, 2004. This work was supported by the National Research Laboratory program of the Ministry of Science and Technology of Korea. H.-K. Lee and E. Yoon are with the Department of Electrical Engineering and Computer Science, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 305-701, Korea (e-mail: email@example.com). K.-S. Kim is with Microsystem Research Center, P&I Laboratory, Tokyo Institute of Technology, Yokohama 226-8503, Japan. Digital Object Identifier 10.1109/LPT.2004.833068 Fig. 1. Conceptual diagram of the proposed tunable optical filter using magnetic actuation and three types of springs tested for linear displacement: (a) straight bar; (b) corrugation; and (c) meander-type springs.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering