O-PTIR non-contact submicron visible probe infrared spectroscopy

The use of O-PTIR non-contact submicron visible probe to detect the photothermal IR effect is the key breakthrough. It enables non-contact, submicron IR spectroscopy in reflection mode. This provides new analytical capabilities to analyse polymers, life science samples, particulates and more.

non-contact submicron visible probe infrared spectroscopy


O-PTIR non-contact submicron visible probe infrared spectroscopy

Problem solved.

O-PTIR non-contact submicron visible probe detection of the photothermal IR effect overcomes the key limitation of traditional FTIR/QCL microscopy. It does this by removing the fundamental spatial resolution limits of IR spectroscopy (10-20 microns). This limit is now governed by the visible beam wavelength. O-PTIR achieves submicron spatial resolution, all in non-contact, reflection mode operation.

Diagram comparing wavelength dependent ATR and FTIR to wavelength independent O-PTIR non-contact submicron infrared spectroscopy
O-PTIR diagram showing how photothermal spectroscopy is used to analyze the sample

“This is truly an exciting technology. The quality of the spectral data, at such high level of spatial resolution, is amazing.”

Professor John Reffner
John Jay College of
Criminal Justice (CUNY)
Pioneer in FTIR microspectroscopy

Spectra on thick samples that correlate to transmission FTIR

O-PTIR provides the best of both worlds. It combines the convenience of a non-contact reflection mode technique with “FTIR transmission-like” quality. The spectra are collected in reflection mode, where thickness, surface roughness or particle shape/size are not issues.
Below: Three different O-PTIR spectra collected off of samples of 20 µm thick (below) were searched against the KnowItAll® database. The results were high matches for polystyrene (PS) (left), polyethylene terephthalate (PET) (middle) and polymethyl methacrylate (PMMA) (right).

Three KnowITAll results showing spectra for PS, PET, and PMMA as a result of noncontact submicron infrared spectroscopy

mIRage combines O-PTIR and Raman
to improve results

The world’s first simultaneous IR+Raman microscopy system is a unique dual modality platform that combines all the advantages of O-PTIR with complementary Raman microscopy via simultaneous detection of the visible probe laser.

Photothermal Spectroscopy Corp

325 Chapala Street
Santa Barbara, CA 93101

Phone: (805) 845-6568
Email: info [at] photothermal.com