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The rapid development of various scanning probe methods like SFM or AFM involving microcantilever based sensor
technology has slowly enabled mechanical motion to regain its place in the field of science and engineering by
miniaturization of mechanical systems down to sub-micron dimensions. Such scaling down of dimensions of
microstructures exhibit very high sensitivity to mechanical deformations due to various induced loads. The most widely
used Optical beam deflection method (OBDM) for measuring such deflections in microcantilever based sensors is
limited by diffraction effects due to dimensional constraints of the structures involved. The use of polymer materials like
poly HDDA having very low elastic modulus has the potential to achieve high mechanical deformation sensitivity for
even moderately scaled down structures. Poly-HDDA based microcantilever sensors are being fabricated in an in house
realized Microstereolithographic system. The objective is to fabricate a double micro-cantilever structure of length
600 μm, width 60 μm and thickness 40 μm each with a gap of 100 μm between the two along the thickness dimension.
The relative deflection profile of one of the fabricated cantilevers due to induced surface stress by the self-assembly of
Alkanethiol on Gold is proposed to be measured by an optical diffraction based method. Proposed surface stress
resolution achieved in such a typical microcantilever based sensor is of the order of 1 mN/m for a deflection of 0.5 nm at
free end of one of the micro-structures subjected to self-assembly mechanism. The high thermal stability and very low
elastic modulus of Poly-HDDA enables its application as a low noise, very high sensitive sensor material for detection of
mechanical deforming agents in microcantilever based sensor technology.
Ankur Goswami,Arindam Phani,Ankit Krisna,N. Balashanmugam,Giridhar Madras, andA. M. Umarji
"Poly-HDDA microstructure fabrication using microstereolithography for microcantilever-based sensor technology", Proc. SPIE 7926, Micromachining and Microfabrication Process Technology XVI, 79260C (14 February 2011); https://doi.org/10.1117/12.888045
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Ankur Goswami, Arindam Phani, Ankit Krisna, N. Balashanmugam, Giridhar Madras, A. M. Umarji, "Poly-HDDA microstructure fabrication using microstereolithography for microcantilever-based sensor technology," Proc. SPIE 7926, Micromachining and Microfabrication Process Technology XVI, 79260C (14 February 2011); https://doi.org/10.1117/12.888045