Abstract
Simulation of detecting photoelectrons using multi-level multi-electron (MLME) finite-difference time-domain (FDTD) method with an application to near-field subwavelength imaging based on semiconductor nanophotodetector (NPD) array is reported. The photocurrents from the photodiode pixels are obtained to explore the resolution of this novel NPD device for subwavelength imaging. One limiting factor of the NPD device is the optical power coupling between adjacent detector pixels. We investigate such power coupling in the presence of absorbing media as well as the spatial distributions of the electric field and photoelectron density using the MLME FDTD simulation. Our results show that the detection resolution is about one tenth of the operating wavelength, which is comparable to that of a near-field scanning optical microscope based on metal clad tapered fiber.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 343-347 |
| Number of pages | 5 |
| Journal | Optical and Quantum Electronics |
| Volume | 40 |
| Issue number | 5-6 |
| DOIs | |
| State | Published - Apr 2008 |
Funding
Nanoelectronics and Computing under Award No. NCC 2-1363. This work was also supported by the Korea Research Foundation Grant funded by the Korean Government (MOEHRD) (KRF-2006-214-D00064). Acknowledgements This work was supported by NSF under Award No. ECS-0501589 and ECCS 0622185, by NSF MRSEC program under grant DMR-0076097, by the National Center for Learning & Teaching in Nanoscale Science and Engineering (NCLT) under the NSF Grant No. 0426328, and by the NASA Institute for
Keywords
- FDTD simulation
- Nanoscale photodetector (NPD) array
- Photocurrent
- Subwavelength resolution
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering