2015
DOI: 10.1364/oe.23.032063
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Broadband infrared vibrational nano-spectroscopy using thermal blackbody radiation

Abstract: Infrared vibrational nano-spectroscopy based on scattering scanning near-field optical microscopy (s-SNOM) provides intrinsic chemical specificity with nanometer spatial resolution. Here we use incoherent infrared radiation from a 1400 K thermal blackbody emitter for broadband infrared (IR) nano-spectroscopy. With optimized interferometric heterodyne signal amplification we achieve few-monolayer sensitivity in phonon polariton spectroscopy and attomolar molecular vibrational spectroscopy. Near-field localizati… Show more

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Cited by 17 publications
(19 citation statements)
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“…This low spectral irradiance is particularly limiting for infrared near-field experiments, where the use of these thermal sources has so far only been workable for systems that exhibit a very strong IR response. [27,28] Alternatively, plasma sources (~9000 K) operate at a much higher effective temperature than conventional thermal sources (~1400 K) and consequently have higher radiances as well as emitter areas as low as <500 m in diameter. [29] Although an improvement over conventional thermal sources, the spectral irradiance and stability of these sources are still limiting for near-field applications.…”
Section: Synchrotron Ir Compared To Other Ir Sourcesmentioning
confidence: 99%
“…This low spectral irradiance is particularly limiting for infrared near-field experiments, where the use of these thermal sources has so far only been workable for systems that exhibit a very strong IR response. [27,28] Alternatively, plasma sources (~9000 K) operate at a much higher effective temperature than conventional thermal sources (~1400 K) and consequently have higher radiances as well as emitter areas as low as <500 m in diameter. [29] Although an improvement over conventional thermal sources, the spectral irradiance and stability of these sources are still limiting for near-field applications.…”
Section: Synchrotron Ir Compared To Other Ir Sourcesmentioning
confidence: 99%
“…By simultaneously illuminating this nearfield probe with a focused light beam, the tip acts as an optical antenna which strongly confines the incident optical field around the tip apex, thus providing a nanoscale light source for high-resolution imaging and spectroscopy. A full IR spectrum at each image pixel is usually obtained by combining s-SNOM with FTIR spectroscopy, when using a broadband IR source in the form of laser, thermal, or synchrotron radiation (nano-FTIR) [12][13][14][15][16][17][18][19].…”
Section: Introductionmentioning
confidence: 99%
“…Thermal blackbody light sources like the globar provide a large spectral bandwidth but low intensities. Hence, significant integration time is required to obtain data with a globar and there is no usable intensity below ~750 cm −1 for broadband S-SNOM [12,13]. Previously, a globar was implemented as a broadband infrared source in our own near-field experimental setup.…”
Section: Introductionmentioning
confidence: 99%