Highly Strained Compliant Optical Metamaterials with Large Frequency Tunability

Nano Letters ◽  
2010 ◽  
Vol 10 (10) ◽  
pp. 4222-4227 ◽  
Author(s):  
Imogen M. Pryce ◽  
Koray Aydin ◽  
Yousif A. Kelaita ◽  
Ryan M. Briggs ◽  
Harry A. Atwater
Keyword(s):  
Optical Metamaterials ◽  
Frequency Tunability ◽  
Highly Strained ◽  
Large Frequency

scholarly journals Fabrication of Spin-Transfer Nano-Oscillator by Colloidal Lithography

2015 ◽  
Vol 2015 ◽  
pp. 1-6
Author(s):  
Bin Fang ◽  
Jiafeng Feng ◽  
Hongxiang Wei ◽  
Xiufeng Han ◽  
Baoshun Zhang ◽  
...  
Keyword(s):  
Magnetic Tunnel Junction ◽  
Cost Effective ◽  
Spin Transfer ◽  
Microwave Emission ◽  
Colloidal Nanoparticles ◽  
Frequency Tunability ◽  
Lithographic Mask ◽  
Sophisticated Equipment ◽  
On Chip ◽  
Large Frequency

We fabricate nanoscale spin-transfer oscillators (STOs) by utilizing colloidal nanoparticles as a lithographic mask. By this approach, high quality STO devices can be fabricated, and as an example the fabricated STO devices using MgO magnetic tunnel junction as the basic cell exhibit current-induced microwave emission with a large frequency tunability of 0.22 GHz/mA. Compared to the conventional approaches that involve a step of defining nanoscale elements by means of electron beam lithography, which is not readily available for many groups, our strategy for STO fabrication does not require the sophisticated equipment (~ million dollars per unit) and expensive lithography resist, while being cost-effective and easy to use in laboratory level. This will accelerate efforts to implement STO into on-chip integrated high-radio frequency applications.

scholarly journals Characterization of the tunable response of highly strained compliant optical metamaterials

2011 ◽  
Vol 369 (1950) ◽  
pp. 3447-3455 ◽  
Author(s):  
Imogen M. Pryce ◽  
Koray Aydin ◽  
Yousif A. Kelaita ◽  
Ryan M. Briggs ◽  
Harry A. Atwater
Keyword(s):  
Local Strain ◽  
Elastic Response ◽  
Absorption Feature ◽  
Infrared Sensors ◽  
Additional Degree ◽  
Optical Metamaterials ◽  
Vibration Absorption ◽  
Compliant Substrates ◽  
Deformation Limit ◽  
Highly Strained

Metamaterial designs are typically limited to a narrow operating bandwidth that is predetermined by the fabricated dimensions. Various approaches have previously been used to introduce post-fabrication tunability and thus enable active metamaterials. In this work, we exploit the mechanical deformability of a highly compliant polymeric substrate to achieve dynamic, tunable resonant frequency shifts greater than a resonant linewidth. We investigate the effect of metamaterial shape on the plastic deformation limit of resonators. We find that, for designs in which the local strain is evenly distributed, the response is elastic under larger global tensile strains. The plastic and elastic limits of resonator deformation are explored and the results indicate that, once deformed, the resonators operate within a new envelope of elastic response. We also demonstrate the use of coupled resonator systems to add an additional degree of freedom to the frequency tunability and show that compliant substrates can be used as a tool to test coupling strength. Finally, we illustrate how compliant metamaterials could be used as infrared sensors, and show enhancement of an infrared vibration absorption feature by a factor of 225.

Photonic Generation of Phase-Coded Microwave Signal With Large Frequency Tunability

2011 ◽  
Vol 23 (11) ◽  
pp. 712-714 ◽  
Author(s):  
Ze Li ◽  
Wangzhe Li ◽  
Hao Chi ◽  
Xianmin Zhang ◽  
Jianping Yao
Keyword(s):  
Microwave Signal ◽  
Frequency Tunability ◽  
Photonic Generation ◽  
Large Frequency

Photonic Generation of Phase-Coded Microwave Signal with Large Frequency Tunability

2013 ◽  
Vol 33 (4) ◽  
pp. 0406004
Author(s):  
刘双 Liu Shuang ◽  
钱祖平 Qian Zuping ◽  
王荣 Wang Rong ◽  
蒲涛 Pu Tao
Keyword(s):  
Microwave Signal ◽  
Frequency Tunability ◽  
Photonic Generation ◽  
Large Frequency

Generation of Millimeter Waves with Fine Frequency Tunability Using Mach-Zehnder-Modulator-Based Flat Comb Generator

2013 ◽  
Vol E96.C (2) ◽  
pp. 192-196 ◽  
Author(s):  
Isao MOROHASHI ◽  
Yoshihisa IRIMAJIRI ◽  
Takahide SAKAMOTO ◽  
Tetsuya KAWANISHI ◽  
Motoaki YASUI ◽  
...  
Keyword(s):  
Millimeter Waves ◽  
Frequency Tunability ◽  
Mach Zehnder Modulator

Symmetry Breaking and the Turn-On Fluorescence of Small, Highly Strained Carbon Nanohoops

2019 ◽  
Author(s):  
Terri Lovell ◽  
Curtis Colwell ◽  
Lev N. Zakharov ◽  
Ramesh Jasti
Keyword(s):  
Symmetry Breaking ◽  
Theoretical Work ◽  
P Systems ◽  
Quantum Yields ◽  
Size Dependent ◽  
New Class ◽  
Carbon Carbon Bond ◽  
Conjugated Macrocycles ◽  
Structural Manipulation ◽  
Highly Strained

<p>[<i>n</i>]Cycloparaphenylenes, or “carbon nanohoops,” are unique conjugated macrocycles with radially oriented p-systems similar to those in carbon nanotubes. The centrosymmetric nature and conformational rigidity of these molecules lead to unusual size-dependent photophysical characteristics. To investigate these effects further and expand the family of possible structures, a new class of related carbon nanohoops with broken symmetry is disclosed. In these structures, referred to as <i>meta</i>[<i>n</i>]cycloparaphenylenes, a single carbon-carbon bond is shifted by one position in order to break the centrosymmetric nature of the parent [<i>n</i>]cycloparaphenylenes. Advantageously, the symmetry breaking leads to bright emission in the smaller nanohoops, which are typically non-fluorescent due to optical selection rules. Moreover, this simple structural manipulation retains one of the most unique features of the nanohoop structures-size dependent emissive properties with relatively large extinction coefficents and quantum yields. Inspired by earlier theoretical work by Tretiak and co-workers, this joint synthetic, photophysical, and theoretical study provides further design principles to manipulate the optical properties of this growing class of molecules with radially oriented p-systems.</p>

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