science

Optoelectrofluidics

Optoelectrofluidics is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Optoelectrofluidics rather than just read about it. In short: Optoelectrofluidics, also known as optically induced electrohydrodynamics, refers to the study of the motions of particles or molecules and their interactions with optically-induced electric field and the surrounding fluid. This concept includes electrothermal vortex, electrophoresis, dielectrophoresis, and electroosmosis induced by combination of optical and electrical energy or by optical-electrical energy transfe…

Key takeaways

Optoelectrofluidics belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Optoelectrofluidics to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Optoelectrofluidics from memory before moving on to harder problems.

Reference excerpt

Optoelectrofluidics, also known as optically induced electrohydrodynamics, refers to the study of the motions of particles or molecules and their interactions with optically-induced electric field and the surrounding fluid. This concept includes electrothermal vortex, electrophoresis, dielectrophoresis, and electroosmosis induced by combination of optical and electrical energy or by optical-electrical energy transfer. In 1995, an electrothermal vortices induced by a strong IR (infrared) laser projected into an electric field have been utilized to concentrate microparticles and molecules. In 2000, UV(ultraviolet) pattern projected onto ITO (indium tin oxide) electrode has been applied for patterning colloidal particles. Illumination of the ITO electrode by UV light results in a small increase in the current from the generation of electron-hole pairs at the ITO/water interface. In 2005, optoelectronic tweezers (OET), wherein a photoconductive material was utilized to induce electric field using the optical decrement of electrical resistance on a partially illuminated area, has been reported. After that, many researches in several view-points have been performed as below.

Display Devices 1. DMD(digital micromirror device)-based Optoelectronic Tweezers (OET) : P.Y. Chiou, et al., Nature 436, pp. 370-372 (2005) 2. Projector-based Image Dielectrophoresis (iDEP) : Y.-s. Lu, et al., Opt. Quant. Elec. 37, pp. 1385-1395 (2006) 3. LCD(liquid crystal display)-based Lab-on-a-Display (LOD) : W. Choi, et al., Microfluid. Nanofluid. 3, pp. 217-225 (2007)[link removed] 4. Lens-integrated LCD-based System : H. Hwang, et al., Electrophoresis 29, pp. 1203-1212 (2008)

System Configuration 1. Interactive & Microscope-integrated System : H. Hwang, et al., Electrophoresis 29, pp. 1203-1212 (2008) 2. Double Photoconductive Layers : H. Hwang, et al., Appl. Phys. Lett. 92, pp. 024108 (2008) 3. Floating Electrode OET : S. Park, et al., Appl. Phys. Lett. 92, pp. 151101 (2008) 4. Integration with Electrowetting Device : G.J. Shah, et al., Lab Chip doi:10.1039/b821508a (2009) 5. Optoelectrofluidic Fluorescence Microscopy: H. Hwang and J.-K. Park, Anal. Chem. doi:10.1021/ac901047v (2009)

Target Materials 1. Cultured cells : A.T. Ohta, et al., IEEE J. Sel. Top. Quant. Elec. 13, pp. 237-240 (2007) 2. DNA : M. Hoeb, et al., Biophys. J. 93, pp. 1032-1038 (2007) 3. Blood cell : H. Hwang, et al., Electrophoresis 29, pp. 1203-1212 (2008) 4. Semiconducting nanowires : A. Jamshidi, et al., Nat. Photon. 2, pp. 86-89 (2008) 5. Swimming bacteria : W. Choi, et al., Appl. Phys. Lett. 93, pp. 143901 (2008) 6. Oocyte : H. Hwang, et al., Biomicrofluidics 3, pp. 014103 (2009) 7. Polysaccharide, Protein and Fluorophore : H. Hwang and J.-K. Park, Anal. Chem. doi:10.1021/ac901047v (2009)

Operating Principles 1. Dielectrophoresis (DEP) : Most of the researches above. 2. AC Electro-osmosis (ACEO) : P.-Y. Chiou, et al., J. Microelectromech. Syst. 17, pp. 525-531 (2008) 3. Electro-orientation :W. Choi, et al., Appl. Phys. Lett. 93, pp. 143901 (2008) 4. Electrothermal flow : A. Mizuno, et al., IEEE Trans. Ind. Appl. 31, pp. 464-468 (1995), S.J. Williams, A. Kumar and S. T. Wereley, Lab Chip 8, pp. 1879-1882 (2008) 5. Combination of AC Electrokinetics : H. Hwang and J.-K. Park, Lab Chip 9, pp. 199-206 (2009), H. Hwang and J.-K. Park, Anal. Chem. doi:10.1021/ac901047v (2009) 6. Optically induced electrohydrodynamic instability (OEHI): Feifei Wang, Haibo Yu, Wenfeng Liang, Lianqing Liu, John D. Mai, Gwo-Bin Lee, Wen Jung Li, Microfluidics and Nanofluidics, Volume 16, Issue 6, pp. 1097–1106

Other Phenomena 1. Surface-Particle Interactions : H. Hwang, et al., Appl. Phys. Lett. 92, pp. 024108 (2008) 2. Particle-Particle Interactions : H. Hwang, et al., J. Phys. Chem. B 32, pp. 9903–9908 (2008) doi:10.1021/jp803596r

Applications 1. Microlens Array Fabrication : J.-Y. Huang, Y.-S. Lu and J. A. Teh, Opt. Express 14, pp. 10779-10784 (2006) 2. Microparticle Separation : H. Hwang and J.-K. Park, Lab Chip 9, pp. 199-206 (2009) 3. In vitro Fertilization : H. Hwang, et al., Biomicrofluidics 3, pp. 014103 (2009) 4. Electroporation : J.K. Valley, et al., Lab Chip doi:10.1039/b821678a (2009) 5. Local Chemical Concentration Control : H. Hwang and J.-K. Park, Anal. Chem. doi:10.1021/ac901047v (2009) 6. Colloidal Assembly : H. Hwang, Y.-H. Park and J.-K. Park, Langmuir 25, pp. 6010-6014 (2009)

Research Groups 1. Ming C. Wu's Group : Integrated Photonics Laboratory, UC Berkeley, CA, USA 2. Je-Kyun Park's Group : NanoBiotech Laboratory, KAIST, KOREA 3. P.Y. Chiou's Group : Optoelectronic Biofluidics Laboratory, UCLA, CA, USA 4. Steve Wereley's Group : Microfluidics Laboratory, Purdue University, IN, USA 5. Aloke Kumar's Group : Kumar Biomicrofluidics Laboratory 6. Stuart William's Group : [1] 7. Han-Sheng Chuang's Group : [2]

References

Worked examples

Example 1 — a first encounter with Optoelectrofluidics

Start with the simplest possible case. Write down what Optoelectrofluidics claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Optoelectrofluidics before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Optoelectrofluidics ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Optoelectrofluidics

In research: Optoelectrofluidics appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Optoelectrofluidics in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Optoelectrofluidics is common in secondary-school and first-year university syllabi. It links to neighbouring topics Electrodynamics, so understanding it makes those chapters shorter.
In everyday life: Look for Optoelectrofluidics outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Optoelectrofluidics in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Optoelectrofluidics means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Optoelectrofluidics out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Optoelectrofluidics in simple terms?

Why does Optoelectrofluidics matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Optoelectrofluidics?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Optoelectrofluidics.