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Method to obtain absorption spectra from near-field infrared scattering using homodyne detection

A detector, beam technology, applied in the use of optical devices, measurement devices, nano-optics, etc., can solve problems such as expensive, limited, and reduced signal level

Active Publication Date: 2015-10-14
许晓汲 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although it captures the phase of near-field scattered light, there are two disadvantages associated with the pseudo-heterodyne technique
The first disadvantage is the reduced signal level due to the detection of weak sidebands instead of the main band in the lock detection
A second potential disadvantage is that it measures the phase of near-field scattered light rather than the imaginary part of the near-field
Although it offers multiple technical capabilities, this type of technology requires an expensive (approximately $300k in 2012) coherent broadband light source, which in turn requires low laser energy resulting in inherently low signal quality, which limits its practical application

Method used

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  • Method to obtain absorption spectra from near-field infrared scattering using homodyne detection
  • Method to obtain absorption spectra from near-field infrared scattering using homodyne detection
  • Method to obtain absorption spectra from near-field infrared scattering using homodyne detection

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Embodiment Construction

[0045] In general, embodiments described herein relate to methods of obtaining absorption spectra from near-field infrared scattering using homodyne detection. As required, embodiments of the invention are disclosed herein. However, the disclosed embodiments are exemplary only, and it should be understood that the invention may be embodied in many different and alternative forms.

[0046] The figures are not necessarily to scale and some features may be exaggerated or minimized to show details of particular elements, while related elements may have been omitted to avoid obscuring novel aspects. Therefore, specific methodological, structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one skilled in the art to variously employ the present invention. For purposes of instruction and not limitation, methods for obtaining absorption spectra from near-field infrared sc...

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Abstract

The present disclosure provides a procedure to obtain the absorption profiles of molecular resonance with ANSOM. The method includes setting a reference field phase to phi=0.5 pi relative to the near-field field, and reference amplitude A>=5|alphaeff|. The requirement on phase precision is found to be <0.3 pi. This method enables ANSOM performing vibrational spectroscopy at nanoscale spatial resolution.

Description

[0001] Cross References to Related US Patent Applications [0002] This patent application is related to U.S. Provisional Patent Application No. 61 / 730,201, filed November 27, 2012, and U.S. Utility Patent Application No. USSN 13 / 835,181, filed March 15, 2013, both filed as The titles of "METHOD TO OBTAIN ABSORPTION SPECTRA FROM NEAR-FIELD INFRARED SCATTERING USING HOMODYNE DETECTION" are all submitted in English and are incorporated by reference in their entirety. technical field [0003] The present invention relates to a method for obtaining absorption spectra from near-field infrared scattering using homodyne detection. Background technique [0004] Aperture-free near-field scanning optical microscopy (ANSOM) provides spatial resolution beyond the diffraction limit of light. However, for some spectroscopy applications, there is a key problem to be solved by ANSOM, namely: the directly detectable near-field scattering signal has a dispersion lineshape rather than an abso...

Claims

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Application Information

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IPC IPC(8): G01Q60/06
CPCG01N21/359B82Y20/00B82Y35/00G01Q30/02G01Q60/22G01Q60/06G01B9/0203G01N2201/06113G01N2201/10G01Q10/00
Inventor 许晓汲吉尔伯特·C·沃克
Owner 许晓汲
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