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Electroactive nanowells for spectrographic fluidic memory

Cordovez, Bernardo and Psaltis, Demetri and Erickson, David (2007) Electroactive nanowells for spectrographic fluidic memory. In: Nanoengineering: Fabrication, Properties, Optics, and Devices IV. Proceedings of SPIE. No.6645. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 66451M. ISBN 9780819467935.

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Current optical storage devices such as DVDs have their read/write capabilities fundamentally restricted by the diffraction limit of light. We present an optofluidic architecture for storing cocktails of colloidal quantum dots in electroactive nanowell structures. One application of these devices is the development of a fluidic memory approach which could enable the generation, reading and erasing of multiple bit information packages on single light diffraction limited data marks by spectral and intensity multiplexing of quantum dot cocktails. Here we focus on the development of the electroactive nanowell trapping architecture. Briefly, we have shown that by applying an electric potential between a top and bottom Indium Tin Oxide (ITO) electrodes, particles ranging from 5μm polystyrene spheres to 5nm quantum dots suspended in solution can be attracted, stored and rejected from a targeted well structure by electrokinetic actuation. Nanowells 100 nm in diameter and 1 μm deep were fabricated by depositing silicon and a small oxide thin film on top of an ITO cover slip, patterning the wells on electron beam resist followed by a series of dry etching steps that leave the ITO substrate exposed in the well sites. When the quantum dots are electrokinetically transported to their sensing sites, they are then excited by a UV-blue light, and their discrete fluorescent signal is captured by a fiber spectrometer. Data erasure can be selectively performed by reversing the polarity of the field and ejecting the quantum dots from the nanowell data marks.

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Additional Information:© 2007 Society of Photo-Optical Instrumentation Engineers (SPIE). This work is supported by National Science Foundation through the Sensors and Sensor Networks program under grant NSF/CTS 0529045.
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Subject Keywords:Optofluidics, Electrokinetics, Quantum dots, Spectrophotometry
Series Name:Proceedings of SPIE
Issue or Number:6645
Record Number:CaltechAUTHORS:20190712-125522750
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Official Citation:Bernardo Cordovez, Demetri Psaltis, and David Erickson "Electroactive nanowells for spectrographic fluidic memory", Proc. SPIE 6645, Nanoengineering: Fabrication, Properties, Optics, and Devices IV, 66451M (11 September 2007);
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:97130
Deposited By: Tony Diaz
Deposited On:12 Jul 2019 20:17
Last Modified:16 Nov 2021 17:26

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