Navigation Links
Flat lens offers a perfect image
Date:8/24/2012

Cambridge, Mass. August 23, 2012 Applied physicists at the Harvard School of Engineering and Applied Sciences (SEAS) have created an ultrathin, flat lens that focuses light without imparting the distortions of conventional lenses.

At a mere 60 nanometers thick, the flat lens is essentially two-dimensional, yet its focusing power approaches the ultimate physical limit set by the laws of diffraction.

Operating at telecom wavelengths (i.e., the range commonly used in fiber-optic communications), the new device is completely scalable, from near-infrared to terahertz wavelengths, and simple to manufacture. The results have been published online in the journal Nano Letters.

"Our flat lens opens up a new type of technology," says principal investigator Federico Capasso, Robert L. Wallace Professor of Applied Physics and Vinton Hayes Senior Research Fellow in Electrical Engineering at SEAS. "We're presenting a new way of making lenses. Instead of creating phase delays as light propagates through the thickness of the material, you can create an instantaneous phase shift right at the surface of the lens. It's extremely exciting."

Capasso and his collaborators at SEAS create the flat lens by plating a very thin wafer of silicon with an nanometer-thin layer of gold. Next, they strip away parts of the gold layer to leave behind an array of V-shaped structures, evenly spaced in rows across the surface. When Capasso's group shines a laser onto the flat lens, these structures act as nanoantennas that capture the incoming light and hold onto it briefly before releasing it again. Those delays, which are precisely tuned across the surface of the lens, change the direction of the light in the same way that a thick glass lens would, with an important distinction.

The flat lens eliminates optical aberrations such as the "fish-eye" effect that results from conventional wide-angle lenses. Astigmatism and coma aberrations also do not occur with the flat lens, so the resulting image or signal is completely accurate and does not require any complex corrective techniques.

The array of nanoantennas, dubbed a "metasurface," can be tuned for specific wavelengths of light by simply changing the size, angle, and spacing of the antennas.

"In the future we can potentially replace all the bulk components in the majority of optical systems with just flat surfaces," says lead author Francesco Aieta, a visiting graduate student from the Universit Politecnica delle Marche in Italy. "It certainly captures the imagination."


'/>"/>
Contact: Caroline Perry
cperry@seas.harvard.edu
617-496-1351
Harvard University
Source:Eurekalert  

Related biology technology :

1. Fortis Offers Bachelor of Science in Nursing Degree Program to Florida Students
2. Gundersen Lutheran Offers Heart Surgery with Less Pain, Faster Recovery
3. UH Case Medical Center Offers New Therapy for Gynecologic Cancer Patients
4. Butamax Granted Core Patent for Making Biobutanol and Distillers Grains; Offers Producers Efficient, Low-Cost Production of Biobutanol
5. Big Saver: Molderizer Offers 30% Mold Remediation Products Price Cut
6. Tri-Valley Sedation Dentist Dr. Endre Selmeczy Now Offers High-quality Dental Restorations
7. Berkshire Corporation Offers Live Chat For Americas Website and Shopping Cart
8. Salimetrics Offers New Saliva Collection Aid for Easy Collection of Passive Drool Samples
9. AMRESCO Offers New Prism Protein Marker With Vibrant Colors For Easy Band Identification
10. Dr. Ross Kaplan Offers New State-of-the-Art Wrinkle, Fine Line, and Skin Texture Improvement Treatment
11. Imperfections may improve graphene sensors
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Flat lens offers a perfect image
(Date:2/28/2017)... ... February 28, 2017 , ... ... of antibody therapeutics from millions-diverse immune repertoires, today announced a strategic partnership with ... strains genetically engineered to express human antibodies. The partnership will use GigaGen technology ...
(Date:2/28/2017)... , Feb. 28, 2017  ITL Limited ... company, supplier and strategic partner that provides innovative ... individual health management, formally announces its rebrand to ... name change is part of the Company,s unified ... launch of an integrated corporate website, ITLHealthGroup.com ...
(Date:2/28/2017)... and NEW YORK , February ... License Application accepted by the FDA for avelumab  ... disease has metastasized   ... Germany , in the US and ... US Food and Drug Administration (FDA) has accepted for Priority ...
(Date:2/27/2017)... -- A Europe-wide survey of institutes conducted by the ... their research treat them with due care. The survey polled a ... the results indicates that there is a strong commitment among animal ... the principles of the 3Rs (Refine, Reduce, Replace)  ... What are the 3Rs? ...
Breaking Biology Technology:
(Date:2/13/2017)... 2017  RSA Conference -- RSA, a Dell Technologies ... to enhance fraud detection and investigation across digital ... Fraud & Risk Intelligence Suite. The new platform ... insights from internal and external sources as well ... customers from targeted cybercrime attacks. "Fraudsters ...
(Date:2/9/2017)... Feb. 9, 2017 The biomass boiler market ... the biomass boiler market globally in terms of revenue ... boilers. The market for biomass boilers has been segmented ... application, and country/region. The market based on feedstock type, ... residues, biogas & energy crops, urban residues, and others. ...
(Date:2/8/2017)... , Feb. 7, 2017 Report Highlights ... The global ... reach $11.4 billion by 2021, growing at a compound annual ... - An overview of the global markets for synthetic biology. ... estimates for 2016, and projections of compound annual growth rates ...
Breaking Biology News(10 mins):