NANOSCALE CHEMICAL IMAGING OF PLASMONIC HOT-SPOTS AND DARK MODES USING PHOTO THERMAL INDUCED RESONANCE TECHNIQUE

Basudev Lahiri, Glen Holland, Vladimir Aksyuk and Andrea Centrone

Photo-Thermal Induced Resonance (PTIR) technique combines the high lateral resolution of Atomic Force Microscopy (AFM) and the high chemical specificity of Infrared (IR) Spectroscopy to produce nanoscale chemical images. In this work, PTIR technique is used for the first time to image bright and dark plasmonic resonances of gold Asymmetric Split Ring Resonators (A-SRRs) with nanoscale resolution. Additionally, The PTIR technique is used to map the local infrared absorption enhancement at the nanoscale, revealing absorption hot spots with local enhancement factors up to 50 times at 100 nm lateral resolution, several times better than the diffraction limit of IR light.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Name: Basudev Lahiri

 

Sigma Xi member? NO

 

Advisorís Name: Andrea Centrone

 

Division: 620

 

Laboratory: CNST

 

Office (Bldg./Office): 216/B119

 

Mail Stop: 6204

 

Phone: x5326

 

E-mail: basudev.lahiri@nist.gov

 

Postdoc category: CNST/UMD

 

Poster Category: Material Science