Cardiff University | Prifysgol Caerdydd ORCA
Online Research @ Cardiff 
WelshClear Cookie - decide language by browser settings

High-efficiency ultrafast optical-to-electrical converters based on inas nanowire-plasmonic arrays

Ren, Dingkun, Rong, Zixuan, Kim, Hyunseok, Turan, Deniz and Huffaker, Diana L. 2019. High-efficiency ultrafast optical-to-electrical converters based on inas nanowire-plasmonic arrays. Optics Letters 44 (19) , pp. 4666-4669.
Item availability restricted.

[img] PDF - Accepted Post-Print Version
Restricted to Repository staff only until 18 September 2020 due to copyright restrictions.

Download (1MB)

Abstract

There has been a growing interest in developing high-efficiency ultrafast optical-to-electrical converters for advanced imaging and sensing applications. Here, we propose a three-dimensional (3D) plasmonic platform based on InAs nanowire arrays with self-assembled gold gratings, which converts a telecom-wavelength (1550 nm) optical beam to sub-picosecond current pulses with quantum efficiency up to 18.3%, while operating in photovoltaic mode, i.e., at zero bias. Using a comprehensive 3D photoresponse model, we reveal that the incident photons form tightly confined fields near the gratings at nanowire tips, and thus a majority of the photogenerated carriers are efficiently routed to the metal within a few tens of nanometers distance, resulting in ultrafast current pulses. In addition, we show that the amplitude of current pulses is robust to the nanowire surface quality and can be effectively tuned by varying the doping levels in nanowires. This work paves a way to realizing a low-power, highly compact, and low-cost device scheme for ultrafast pulse generation.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Optical Society of America
ISSN: 0146-9592
Date of First Compliant Deposit: 9 September 2019
Date of Acceptance: 28 August 2019
Last Modified: 18 Oct 2019 05:41
URI: http://orca.cf.ac.uk/id/eprint/125351

Actions (repository staff only)

Edit Item Edit Item

Downloads

Downloads per month over past year

View more statistics