Bimaterial microcantilevers with black silicon nanocone arrays
| Autor: | Gang Logan Liu, William P. King, Rohit Bhargava, Jing Jiang, Beomjin Kwon, Zhida Xu, Matthew V. Schulmerich |
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| Rok vydání: | 2013 |
| Předmět: |
Materials science
Fabrication Cantilever Silicon business.industry Infrared Black silicon Metals and Alloys chemistry.chemical_element Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials Absorbance Responsivity chemistry.chemical_compound Optics chemistry Electrical and Electronic Engineering Fourier transform infrared spectroscopy business Instrumentation |
| Zdroj: | Sensors and Actuators A: Physical. 199:143-148 |
| ISSN: | 0924-4247 |
| DOI: | 10.1016/j.sna.2013.05.007 |
| Popis: | The performance of infrared (IR) sensing bimaterial cantilevers depends upon the thermal, mechanical and optical properties of the cantilever materials. This paper presents bimaterial cantilevers that have a layer of black silicon nanocone arrays, which has larger optical absorbance and mechanical compliance than single crystal silicon. The black silicon consists of nanometer-scale silicon cones of height 104–336 nm, fabricated using a three-step O 2 –CHF 3 –Ar + Cl 2 plasma process. The average cantilever absorbance was 0.16 over the 3–10 μm wavelength region, measured using a Fourier transform infrared (FTIR) microspectrometer. The measured cantilever responsivity to incident IR light compares well to a model of cantilever behavior that relate the spectral absorbance, heat transfer, and thermal expansion. The model also provides further insights into the influence of the nanocone height on the absorbance and responsivity of the cantilever. Compared to a cantilever with smooth single crystal silicon, the cantilever with black silicon has about 2× increased responsivity. The nanocone array fabrication technique for silicon bimaterial cantilevers presented here could be applied to other IR sensors. |
| Databáze: | OpenAIRE |
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