Near-field imaging of femtosecond laser ablated sub-
/4 holes in lithium niobate
We report on the direct femtosecond laser ablation of sub-/4 (80–250 nm) holes in LiNbO3 crystals and on its local near-field imaging. We show that the near-field transmission of holes can featu...
/4 holes in lithium niobateWe report on the direct femtosecond laser ablation of sub-/4 (80–250 nm) holes in LiNbO3 crystals and on its local near-field imaging. We show that the near-field transmission of holes can featu...
Flexible metamaterials for wireless strain sensing
We proposed and demonstrated flexible metamaterial-based wireless strain sensors that include arrays of split ring resonators (SRRs) to telemetrically measure strain. For these metamaterial sensors, w...
We proposed and demonstrated flexible metamaterial-based wireless strain sensors that include arrays of split ring resonators (SRRs) to telemetrically measure strain. For these metamaterial sensors, w...
Optical position clamping with predictive control
Appl. Phys. Lett. 95, 181104 (2009); doi:10.1063/1.3257693
Published 4 November 2009
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We increase the effective stiffness of optical tweezers by position clamping a polystyrene bead with a predictive feedback control algorithm. This algorithm mitigates the effect of feedback loop delay. Hence, higher gain than with proportional control can be employed, which results in higher effective trap stiffness, without trap instability. In experiments (initial trap stiffness 0.056 pN/nm with a 1.78 µm diameter polystyrene bead), predictive control increased the effective trap stiffness by 55% relative to proportional control. We also derive theoretical expressions for the power spectra of the bead position controlled by our algorithm.
©2009 American Institute of Physics
| History: | Received 3 September 2009; accepted 10 October 2009; published 4 November 2009 |
| Permalink: |
http://link.aip.org/link/?APPLAB/95/181104/1 |
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