Interferometric microscopy or Imaging interferometric microscopy is the concept of microscopy which is related to holography, synthetic-aperture imaging, and off-axis-dark-field illumination techniques. Interferometric microscopy allows enhancement of resolution of optical microscopy due to interferometric (holographic) registration of several partial images (amplitude and phase) and the numerical combining.
Combining of partial images
In interferometric microscopy, the image of a micro-object is synthesized numerically as a coherent combination of partial images with registered amplitude and phase. For registration of partial images, a conventional holographic set-up is used with a reference wave, as is usual in optical holography. Capturing multiple exposures allows the numerical emulation of a large numerical aperture objective from images obtained with an objective lens with smaller-value numerical aperture. Similar techniques allows scanning and precise detection of small particles. As the combined image keeps both amplitude and phase information, the interferometric microscopy can be especially efficient for the phase objects, allowing detection of light variations of index of refraction, which cause the phase shift or the light passing through for a small fraction of a radian.
Although the Interferometric microscopy has been demonstrated only for optical images (visible light), this technique may find application in high resolution atom optics, or optics of neutral atom beams (see Atomic de Broglie microscope), where the Numerical aperture is usually very limited .
- Y.Kuznetsova; A.Neumann, S.R.Brueck (2007). "Imaging interferometric microscopy–approaching the linear systems limits of optical resolution". Optics Express. 15 (11): 6651–6663. Bibcode:2007OExpr..15.6651K. doi:10.1364/OE.15.006651. PMID 19546975.
- C.J.Schwarz; Y.Kuznetsova and S.R.J.Brueck (2003). "Imaging interferometric microscopy". Optics Letters. 28 (16): 1424–6. Bibcode:2003OptL...28.1424S. doi:10.1364/OL.28.001424. PMID 12943079.
- J.Hwang; M.M.Fejer, and W.E.Moerner (2003). "Scanning interferometric microscopy for the detection of ultrasmall phase shifts in condensed matter". Physical Review A. 73 (2): 021802. Bibcode:2006PhRvA..73b1802H. doi:10.1103/PhysRevA.73.021802.
- J.Hwang; M.M.Fejer, and W.E.Moerner (2004). "Scanning interferometric microscopy for the detection of ultrasmall phase shifts in condensed matter". Optik. 115 (2): 94–96. Bibcode:2006PhRvA..73b1802H. doi:10.1103/PhysRevA.73.021802.
- D.Kouznetsov; H. Oberst; K. Shimizu; A. Neumann; Y. Kuznetsova; J.-F. Bisson; K. Ueda; S. R. J. Brueck (2006). "Ridged atomic mirrors and atomic nanoscope". Journal of Physics B. 39 (7): 1605–1623. Bibcode:2006JPhB...39.1605K. CiteSeerX 10.1.1.172.7872. doi:10.1088/0953-4075/39/7/005.