Wood’s anomaly

The calculations are overlaid on Fig. 1.6a as the solid lines and they show the loci are due to n = 1 and -2 SPP modes. On the other hand, the bright (high reflectivity) loci are Wood s anomalies (WAs) and they can be deduced by... 

Fig. 1.6 The experimental (a) p-p and (b) s-s angle-dependent reflectivity mappings of Ag grating taken in the direction normal to the grooves. The dark loci correspond to the low reflectivity regions, indicating the excitation of SPPs. The solid lines are deduced from the ID SPP phase-matching equation, indicating that 1 and -2 SPPs are excited. On the other hand, the dash lines are deduced from the Wood s anomalies equation. The RCWA simulated (c) p-p and (d) s-s reflectivity mappings and they reproduce the experiment well...

Hessel A, Oliner AA (1965) A new theory of Wood s anomalies on optical gratings. Appl Opt 4 1275-1297... 

Figure 2. Steady-state emission spectrum for the epoxy used to attach the GRIN lens to the distal end of the fiber-optic probe. The pronounced dip at 630 nm is due to the Wood s anomaly in the monochromator. Laser excitation at 351.1 nm.

Another point to be aware of is that holographic grating monochromators have a polarization anomaly known as the Wood s anomaly. At certain wavelengths the light is polarized entirely in the horizontal plane. This can cause important spectral artefacts such as false maxima or false shoulders. The anomaly can be avoided by using an excitation depolarizer and emission polarizer as described above. 

Woods RK, Sharp RJ, Holcomb GW 3rd et al (2001) Vascular anomalies and tracheoesophageal compression a single institution s 25-year experience. Ann Thorac Surg 72 438-439... 

Watts, J.C., Woods, D.D., and Patterson, E.S. 1996. Functionally Distributed Coordination During Anomaly Response in Space Shuttle Mission Control. Proceedings of Human Interaction with Complex Systems. IEEE Computer Society Press, Los Alamitos, CA. 

Currarino G, Wood B, Majd M (1993) The genitourinary tract and retroperitoneum. Congenital renal anomalies. In Silverman FN, Kuhn JP (eds) Caffey s pediatric X-ray diagnosis an integrated imaging approach, vol 2, 9th edn. Mosby, St Louis, pp 1223-1243 Dajani AM (1966) Horseshoe kidney a review of 29 cases. Br J Urol 38 388-402... 

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