One dimensional electron spin imaging for single spin detection and manipulation using a gradient field

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Title: One dimensional electron spin imaging for single spin detection and manipulation using a gradient field
Author: Shin, Chang-Seok
Abstract: The ability to resolve molecules individually has many potential applications . These include understanding the local environments of single molecules including details of their interactions with surroundings . The ability to individually address and manipulate the spin states is also required for spin based quantum information processing . Although optical detection techniques , such as optically detected electron spin resonance (ESR ) seem very powerful in these contexts , multiple molecules in the focal volume of a diffraction limited confocal microscope spot cannot in general be resolved individually . Here we propose to solve this problem using optically detected ESR imaging based on the use of high field gradients . In the present research , subwavelength single molecule imaging is demonstrated by using the optically detected ESR technique and the optically detected electron spin echo envelope modulation (ESEEM ) technique . Ultra fast Rabi nutation experiments are also performed to demonstrate the feasibility of fast spin manipulations at a low microwave power . Micrometer sized gradient coils , together with micrometer sized co -planar microstrip transmission lines , are designed and fabricated by optical lithography in order to produce the necessary high magnetic field gradients . These fabricated devices are used to demonstrate this subwavelength imaging technique by imaging single electron spins of the nitrogen -vacancy (NV ) defect in diamond . In this demonstration , multiple NV defects , unresolved in a single focal volume of a diffraction limited microscope are successfully resolved by the optically detected ESR techniques . Specifically , two neighboring NV defects separated by about 170nm are resolved . Ultra Fast electron spin nutation with an oscillation period of 1 .33ns is also achieved by the high microwave magnetic field induced by the current flowing through the fabricated co -planar microstrip lines . These optically detected ESR and ESEEM techniques combined with the micrometer sized gradient coil may find many applications , including single molecule imaging and quantum information processing .
URI: http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2731
Date: 2009-05-15

Citation

One dimensional electron spin imaging for single spin detection and manipulation using a gradient field. Available electronically from http : / /hdl .handle .net /1969 .1 /ETD -TAMU -2731 .

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