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Full-Text Articles in Physics

From Photon To Neuron Chapter 16: Tunneling Of Photons And Electrons, Philip C. Nelson Aug 2018

From Photon To Neuron Chapter 16: Tunneling Of Photons And Electrons, Philip C. Nelson

Department of Physics Papers

This chapter extends Part III of the book From Photon to Neuron (Princeton Univ Press 2017). This preliminary version is made freely available as-is in the hope that it will be useful.


Physics 516: Electromagnetic Phenomena (Spring 2019), Philip C. Nelson Apr 2018

Physics 516: Electromagnetic Phenomena (Spring 2019), Philip C. Nelson

Department of Physics Papers

These course notes are made publicly available in the hope that they will be useful. All reports of errata will be gratefully received. I will also be glad to hear from anyone who reads them, whether or not you find errors: pcn@upenn.edu.


The Role Of Quantum Decoherence In Fret, Philip C. Nelson Jan 2018

The Role Of Quantum Decoherence In Fret, Philip C. Nelson

Department of Physics Papers

Resonance energy transfer has become an indispensable experimental tool for single-molecule and single-cell biophysics. Its physical underpin- nings, however, are subtle: It involves a discrete jump of excitation from one molecule to another, and so we regard it as a strongly quantum- mechanical process. And yet, its kinetics differ from what many of us were taught about two-state quantum systems; quantum superpositions of the states do not seem to arise; and so on. Although J. R. Oppenheimer and T. Förster navigated these subtleties successfully, it remains hard to find an elementary derivation in modern language. The key step involves acknowledging ...


Time To Stop Telling Biophysics Students That Light Is Primarily A Wave, Philip C. Nelson Jan 2018

Time To Stop Telling Biophysics Students That Light Is Primarily A Wave, Philip C. Nelson

Department of Physics Papers

Standard pedagogy introduces optics as though it were a consequence of Maxwell’s equations, and only grudgingly admits, usually in a rushed aside, that light has a particulate character that can somehow be reconciled with the wave picture. Recent revolutionary advances in optical imaging, however, make this approach more and more unhelpful: How are we to describe two-photon imaging, FRET, localization microscopy, and a host of related techniques to students who think of light primarily as a wave? I was surprised to find that everything I wanted my biophysics students to know about light, including image formation, x-ray diffraction, and ...


Student Resources For: From Photon To Neuron, Light, Imaging, Vision, Philip C. Nelson Feb 2017

Student Resources For: From Photon To Neuron, Light, Imaging, Vision, Philip C. Nelson

Department of Physics Papers

This zip archive contains datasets and additional media associated to the book "From Photon to Neuron (Princeton University Press, 2017).


Koh Etching Of (100) Si Wafer, No 2, Inayat Bajwa Sep 2016

Koh Etching Of (100) Si Wafer, No 2, Inayat Bajwa

Protocols and Reports

This report describes KOH etching of (100) Si wafer through a hard mask of silicon oxide, and reveals that the scattered etch rate is ascribed to the etch rates of the different crystal planes exposed during the etching.


Directed Self-Assembly Of Block Copolymer, No1, Hiromichi Yamamoto Aug 2016

Directed Self-Assembly Of Block Copolymer, No1, Hiromichi Yamamoto

Protocols and Reports

The PS-rich and neutral PS-b-PMMA block copolymer (BCP) films were spin coated on the neutral random copolymer hydroxyl-terminated PS-r-PMMA layers grafted on the native oxide and 50 nm thick PECVD amorphous silicon oxide layers. Relationship between the grafting density of BCP and surface density of hydroxyl moiety on silicon oxide is discussed. Furthermore, optimization of annealing BCP films is reported, and wetted and de-wetted BCP films are shown in optical microscope images. In addition, finger print and nanopore structures of BCP films are also indicated in SEM images.


Koh Etching Of (100) Si Wafer, No 1, Inayat Bajwa Mar 2016

Koh Etching Of (100) Si Wafer, No 1, Inayat Bajwa

Protocols and Reports

No abstract provided.