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In this paper, a tunable THz lens array based on reconfigurable metamaterials is reported. The metamaterial consists with 40 × 40 liquid metal microdroplets, in which the shape is tuned under different air pressures. The droplets are formed by injecting the liquid mercury into a pre-designed microchannel network and arranged to focus incident THz wave. The focus spot size can be tuned with different...
The effect of variable micropattern for an advanced compound optical film was investigated. This compound optical film was made by using Lithographie galvanoformung abformung (LIGA)-like process. The multi-step electroforming with micro-void embedded Polydimethylsiloxane (PDMS) was developed. This work presents many innovative processes, such as the homemade gray scale mask to fabricate variable size...
We report an optical phased array (OPA) using high-contrast-grating (HCG) as an electrostatically actuated mirror for the purpose of free space fast beamsteering. In this paper, several attractive properties of HCG mirror are introduced such as single material, high reflectance along a wide bandwidth and low-mass inertia and the fabrication result is shown. ±10° × 10° with 2° beam width is observed...
UAV emitter geolocation systems force the development of small RF receivers with real-time direction of arrival (DOA) estimation capabilities. This paper introduces the Virtual Receiving Array method. A single element receiver samples an RF signal in time, while the UAV flies with a constant velocity. The data is manipulated and a Direct Data Domain algorithm is used to generate good quality DOA estimates...
We demonstrate, for the first-time, long-term culturing of single cells under continuous phototransistor-based optoelectronic tweezers (Ph-OET) trapping. A new device configuration, open-access Ph-OET, is presented to integrate the trapping functionality of Ph-OET with culturing capabilities in a Petri dish. Maintenance of human leukemia cell lines (K562, Jurkat) under optical manipulation for up...
We demonstrate the rapid droplet mixing ability of the Light-Actuated Digital Microfluidics device. A 3×3 array of droplets with 9 different reagent mixing ratios have been successfully generated using a digital light projector.
We report on a new light-actuated digital microfluidics device which is capable of using on demand, `virtual' electrodes formed by a data projector to enable large-scale, parallel manipulation of arbitrarily sized droplets. The device features a thin, high-quality Al2O3 film deposited via atomic layer deposition (ALD) which allows aggressive scaling of the dielectric thickness, while maintaining high...
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