Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International

Wikipedia Affiliate Button

Home > Press > Silicon-graphene hybrid plasmonic waveguide photodetectors beyond 1.55 μm

a. Schematic configuration; b. Optical microscope; c. SEM pictures; d. Cross-section of the present silicon-graphene hybrid plasmonic waveguide with the signal electrode at the middle and the ground electrodes at both sides (here the metal-graphene-metal sandwich structure is utilized); e. The electric field component distribution of the quasi-TE0 mode for the optimized silicon-graphene hybrid plasmonic waveguide; f. Measured frequency response of Device B operating at ¦Ë=2μm (bias voltage: -0.5 V, gate voltage: 2.9 V).

CREDIT
Jingshu Guo, Jiang Li, Chaoyue Liu, Yanlong Yin, Wenhui Wang, Zhenhua Ni, Zhilei Fu, Hui Yu, Yang Xu, Yaocheng Shi, Yungui Ma, Shiming Gao, Liming Tong and Daoxin Dai
a. Schematic configuration; b. Optical microscope; c. SEM pictures; d. Cross-section of the present silicon-graphene hybrid plasmonic waveguide with the signal electrode at the middle and the ground electrodes at both sides (here the metal-graphene-metal sandwich structure is utilized); e. The electric field component distribution of the quasi-TE0 mode for the optimized silicon-graphene hybrid plasmonic waveguide; f. Measured frequency response of Device B operating at ¦Ë=2μm (bias voltage: -0.5 V, gate voltage: 2.9 V). CREDIT Jingshu Guo, Jiang Li, Chaoyue Liu, Yanlong Yin, Wenhui Wang, Zhenhua Ni, Zhilei Fu, Hui Yu, Yang Xu, Yaocheng Shi, Yungui Ma, Shiming Gao, Liming Tong and Daoxin Dai

Abstract:
Silicon photonics is known as a key technology for modern optical communications at the near infrared wavelength-band, i.e., 1.31/1.55 μm. Currently silicon photonics has been desired to be extended to the wavelength-band beyond 1.55 μm, e.g., 2 μm, for important applications in optical communications, nonlinear photonics, and on-chip sensing. However, the realization of high-performance silicon-based waveguide photodetectors beyond 1.55 μm still faces challenges since there are some fabrication issues as well as wavelength-band limitations. As an alternative, two-dimensional materials (e.g., graphene) provide a promising solution because of the ability for broad operation wavelength-bands and the advantage of avoiding structure mismatch in the design and fabrication.

Silicon-graphene hybrid plasmonic waveguide photodetectors beyond 1.55 μm

Changchun, China | Posted on March 13th, 2020

In the paper published in Light: Science & Applications, scientists from Zhejiang University and Southeast University in China proposed and demonstrated high-performance waveguide photodetectors beyond 1.55 μm by introducing a novel silicon-graphene hybrid plasmonic waveguide. In particular, an ultra-thin wide silicon ridge core region with a metal cap atop is introduced to obtain a unique mode field profile, so that light absorption of graphene is enhanced. Furthermore, the fabrication is easy and the graphene-metal contact resistance is reduced, compared to the previous silicon-graphene hybrid waveguides. For example, the graphene absorption efficiencies are as high as 54.3% and 68.6% for 20 μm-long and 50 μm-long absorption regions, when operating at 1.55 μm and 2 μm, respectively.

For the fabricated photodetectors operating at 2 μm, the measured 3 dB-bandwidths are >20 GHz (limited by the experimental setup), while the responsivities are 30-70 mA/W for 0.28 mW input optical power under -0.3V bias voltage. For the photodetectors operating at 1.55 μm, the 3 dB-bandwidth is >40 GHz (limited by the setup), while the measured responsivity is about 0.4 A/W for 0.16 mW input optical power under -0.3V bias voltage.

In this work, the mechanisms in graphene photodetectors are analyzed carefully, which suggested that the photo-thermoelectric effect is the dominant mechanism for photo-response when operating at zero bias voltage. When the photodetector operates at non-zero bias voltages, the dominant mechanism becomes the bolometric or photoconductive effect. This comprehensive analysis helps better understand the photocurrent generation in the graphene-metal interfaces.

These scientists summarize the highlights of their work:

"We have proposed and demonstrated high-performance silicon-graphene hybrid plasmonic waveguide photodetectors beyond 1.55 μm. In particular, a novel silicon-graphene hybrid plasmonic waveguide was used by introducing an ultra-thin wide silicon ridge core region with a metal cap atop. The optical modal filed is manipulated in both vertical and horizontal directions. Thus, the light absorption in graphene is enhanced, meanwhile the metal absorption loss is minimized. This greatly helps achieve sufficient light absorption of graphene within a short absorption region."

"The silicon-graphene waveguide photodetectors operating at 2 μm were demonstrated with a 3 dB-bandwidth over 20 GHz. The measured responsivity is 30-70 mA/W at the bias voltage of -0.3V for input optical power of 0.28 mW. The photodetector at 1.55 μm was also demonstrated with excellent performances. The present work paves the way for achieving high-responsivity and high-speed waveguide photodetectors on silicon for near/mid-infrared wavelength-bands" they added.

"In future works, more efforts should be given to introduce some special junction structures to minimize the dark current and further extend the operation wavelength-band. Graphene waveguide photodetectors may play an important role in mid-infrared silicon photonics, which will play an important role in time resolved spectroscopy, lab-on-chip sensing, nonlinear photonics, as well as optical communication" they said.

####

For more information, please click here

Contacts:
Daoxin Dai

Copyright © Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

RELATED JOURNAL ARTICLE:

Related News Press

Imaging

A step ahead in the race toward ultrafast imaging of single particles April 9th, 2020

House cleaning on the nanoscale: FAU scientists develop method for cleaning surfaces at the nanoscale April 8th, 2020

News and information

A step ahead in the race toward ultrafast imaging of single particles April 9th, 2020

House cleaning on the nanoscale: FAU scientists develop method for cleaning surfaces at the nanoscale April 8th, 2020

A twist connecting magnetism and electronic-band topology: Combined optical and torque measurements establish the microscopic mechanism linking magnetism and electronic-band topology in a Dirac material April 7th, 2020

Graphene/ Graphite

House cleaning on the nanoscale: FAU scientists develop method for cleaning surfaces at the nanoscale April 8th, 2020

A twist connecting magnetism and electronic-band topology: Combined optical and torque measurements establish the microscopic mechanism linking magnetism and electronic-band topology in a Dirac material April 7th, 2020

Wireless/telecommunications/RF/Antennas/Microwaves

Powering the future: Smallest all-digital circuit opens doors to 5 nm next-gen semiconductor February 11th, 2020

The Wave of the Future: Researchers achieve first successful generation and detection of pure spin currents in antiferromagnetic materials January 29th, 2020

Quantum physics: On the way to quantum networks January 24th, 2020

At CES 2020, CEA-Leti Will Demo System that Eliminates Interference in LiFi Networks: System from CEA-Leti Detects Interference And Optimizes Data Transmission Rates for Each Nearby Device December 20th, 2019

Lab-on-a-chip

Moving diagnostics out of the lab and into your hand: Electrochemical sensor platform technology could enable portable, multiplexed, point-of-care diagnostics for a wide range of applications November 11th, 2019

Trapping and moving tiny particles using light September 24th, 2019

Optical vacuum cleaner can manipulate nanoparticles: The TPU and international researchers developed a concept for constructing an optical vacuum cleaner; due to its optical properties, it can trap nanoparticles from the environment; currently, there are no sufficiently effective September 13th, 2019

Optofluidic chip with nanopore 'smart gate' developed for single molecule analysis: Programmable device enables on-demand delivery of individual biomolecules with feedback-controlled gating for high-throughput analysis August 16th, 2019

Govt.-Legislation/Regulation/Funding/Policy

A step ahead in the race toward ultrafast imaging of single particles April 9th, 2020

A twist connecting magnetism and electronic-band topology: Combined optical and torque measurements establish the microscopic mechanism linking magnetism and electronic-band topology in a Dirac material April 7th, 2020

A combined optical transmitter and receiver: Bidirectional optical signal transmission between two identical devices using perovskite diodes April 3rd, 2020

3D reconstructions of individual nanoparticles: Liquid phase electron microscopy illuminates 3D atomic structures of platinum nanoparticles, advancing full control of nanoengineering April 3rd, 2020

Possible Futures

A step ahead in the race toward ultrafast imaging of single particles April 9th, 2020

House cleaning on the nanoscale: FAU scientists develop method for cleaning surfaces at the nanoscale April 8th, 2020

A twist connecting magnetism and electronic-band topology: Combined optical and torque measurements establish the microscopic mechanism linking magnetism and electronic-band topology in a Dirac material April 7th, 2020

New measurements reveal evidence of elusive particles in a newly-discovered superconductor: Material may be natural home to quasiparticle hiding for decades April 3rd, 2020

Discoveries

A step ahead in the race toward ultrafast imaging of single particles April 9th, 2020

House cleaning on the nanoscale: FAU scientists develop method for cleaning surfaces at the nanoscale April 8th, 2020

A twist connecting magnetism and electronic-band topology: Combined optical and torque measurements establish the microscopic mechanism linking magnetism and electronic-band topology in a Dirac material April 7th, 2020

New measurements reveal evidence of elusive particles in a newly-discovered superconductor: Material may be natural home to quasiparticle hiding for decades April 3rd, 2020

Announcements

A step ahead in the race toward ultrafast imaging of single particles April 9th, 2020

House cleaning on the nanoscale: FAU scientists develop method for cleaning surfaces at the nanoscale April 8th, 2020

A twist connecting magnetism and electronic-band topology: Combined optical and torque measurements establish the microscopic mechanism linking magnetism and electronic-band topology in a Dirac material April 7th, 2020

New measurements reveal evidence of elusive particles in a newly-discovered superconductor: Material may be natural home to quasiparticle hiding for decades April 3rd, 2020

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters

A step ahead in the race toward ultrafast imaging of single particles April 9th, 2020

A twist connecting magnetism and electronic-band topology: Combined optical and torque measurements establish the microscopic mechanism linking magnetism and electronic-band topology in a Dirac material April 7th, 2020

New measurements reveal evidence of elusive particles in a newly-discovered superconductor: Material may be natural home to quasiparticle hiding for decades April 3rd, 2020

3D reconstructions of individual nanoparticles: Liquid phase electron microscopy illuminates 3D atomic structures of platinum nanoparticles, advancing full control of nanoengineering April 3rd, 2020

Photonics/Optics/Lasers

A combined optical transmitter and receiver: Bidirectional optical signal transmission between two identical devices using perovskite diodes April 3rd, 2020

Light in the tunnel March 26th, 2020

Heterostructure and Q-factor engineering for low-threshold and persistent nanowire lasing March 22nd, 2020

On-chip single-mode CdS nanowire laser March 21st, 2020

Research partnerships

A combined optical transmitter and receiver: Bidirectional optical signal transmission between two identical devices using perovskite diodes April 3rd, 2020

3D reconstructions of individual nanoparticles: Liquid phase electron microscopy illuminates 3D atomic structures of platinum nanoparticles, advancing full control of nanoengineering April 3rd, 2020

Carbon nanotubes forecast when vegetables spoil and buds bloom April 2nd, 2020

A pigment from ancient Egypt to modern microscopy: Göttingen research team produces new nanosheets for near infrared imaging March 23rd, 2020

NanoNews-Digest
The latest news from around the world, FREE



  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project