1. Presented by: Kyle Hershey Jason Maldonis

2. Five Dimensions: 3x Spatial Dimensions Polarization Wavelength

3. Quantized electron oscillation at surface between dialectric and metal. Can be excited by photons. Wavelength needed for excitation dependent on aspect ratio. Can only be excited by photons at certain incident angles. Schematic representation of an electron density wave propagating along a metal – dielectric interface. The charge density oscillations and associated electromagnetic fields are called surface plasmon-polaritonwaves. The exponential dependence of the electromagnetic field intensity on the distance away from the interface is shown on the right. These waves can be excited very efficiently with light in the visible range of the electromagnetic spectrum.dielectricsurface plasmon-polariton

4. Two photons used to excite molecules Then emit a single photon http://www.ncl.ac.uk/bioimaging/techniques/2photon/

5. One of the photons can excite SPR, increasing the electric field around particle Creates higher chance of emitting a photon Since SPR depends on incident angle, we have polarization dependence in TPL http://ej.iop.org/images/0957-4484/24/7/075201/Full/nano447839f2_online.jpg

6. Fempto second laser pulse One of two polarizations One of three wavelengths If polarization and wavelength matches nanorods orientation and aspect ratio then it melts Melts only if laser is focused on that pixel (in 3D space)

7. Pixels are ~ 500nm x 500nm Notice selective reshaping 100 nm Before After

8. TPL has much higher angular dependence allowing for two distinct polarizations Other polarizations and wavelengths are unaffected (d-f)

10. Disclaimer: single write only Best HDNormal HD5D Nanorods 2D information density (Gbit /m 2 )2.3 * 10 5 1.5 * 10 5 2.2 * 10 5 Layer spacing (m)7.05 * 10 -4 1.87 * 10 -3 1.1 * 10 -5 3D information density (Gbit /m 3 )3.3 * 10 8 8.3 * 10 7 2.0 * 10 10

11. Five-dimensional optical recording mediated by surface plasmons in gold nanorods Peter Zijlstra, James W. M. Chon, Min Gu Surface plasmon effects on two photon luminescence of gold nanorods Da-Shin Wang, Fu-Yin Hsu, Chii-Wann Lin en.wikipedia.org/wiki/Memory_storage_density www.pctechguide.com/hard-disks/hard-disk-hard-drive-construction www.techradar.com/us/news/computing-components/storage/how- the-humble-hard-drive-is-made-667183