Tunable photonics with high refractive index

 
Post new topic   Reply to topic    Institute of Nanotechnology Forum Index -> Nanotechnology
View previous topic :: View next topic  
Author Message
nanoorg
Site Admin


Joined: 16 Mar 2004
Posts: 1392

PostPosted: Mon Feb 04, 2008 11:11 am    Post subject: Tunable photonics with high refractive index Reply with quote

Jenna Wilson

Scientists in Hong Kong have created a polymer with a refractive index that can be tuned as high as 1.81.

The refractive index (RI) is a measure of how much the speed of light is reduced in a medium. Conventional organic glasses such as PMMA have a particularly low RI and also within a narrow wavelength range. Therefore although they are cheap to produce, flexible and easy to coat onto large surfaces, their optical properties are limited.

Ben Zhong Tang's group from the Hong Kong University of Science and Technology have attached organometallic nanoclusters to the triple bond network of a hyperbranched polydiyne. This had the effect of increasing the refractive index to 1.81, vastly improving its optical performance.

In addition, they discovered that under UV irradiation the organometallic moiety broke away from the polymer complex. This caused the RI to drop by as much as 0.05 in the 1500-1600 nm region, producing a visible photochromic response.

'Such an unusually high RI change makes our polymer an interesting material for waveguide, memory and holographic storage applications,' said Tang.

In the future, the group hope to induce the change in the RI of this polymer in a reversible manner. They believe that this could lead to write and read as well as erase and rewrite optical memories. 'Such photonic materials could dramatically enhance the data processing speed and optical holographic data storage applications with much higher accessible capacity,' said Tang.




Source: http://www.rsc.org/Publishing/ChemTech/Volume/2007/06/tunable_photonics.asp
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    Institute of Nanotechnology Forum Index -> Nanotechnology All times are GMT
Page 1 of 1
 

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2002 phpBB Group