mehta et al. reply:

Mehta et al. Reply: Ramchandran and Kumar [1] have raised a point against using the term ‘‘zero forward scattering’’ in our Letter [2]. We used the terms forward and backward scatterings in our papers [2,3] in the context of the definition given by IUPAC [4]. However, we agree with their remark that what we observe was not only the vanishing of forward scattering but the vanishing of total scattering. In Fig. 3(d) of our Letter it is clearly seen that both the forward scattered as well as transmitted intensities are zero. Our subsequent findings also agree with their deduction that at the critical field light is resonantly trapped within the medium [5]. R.V. Mehta, Rajesh Patel, Rucha Desai, R.V. Upadhyay, and Kinnari Parekh * Department of Physics Bhavnagar University Bhavnagar, 364002, India Received 11 December 2007; published 5 June 2008 DOI: 10.1103/PhysRevLett.100.229704 PACS numbers: 78.20.Ls, 42.70.Qs, 47.65.Cb, 75.50.Mm *Present address: Physics Department, Faculty of Science, M.S. University of Baroda, Vadodara, 390002, India. [1] Hema Ramchandran and N. Kumar, preceding Comment, Phys. Rev. Lett. 100, 229703 (2008). [2] R.V. Mehta, R. Patel, R. Desai, R.V. Upadhyay, and K. Parekh, Phys. Rev. Lett. 96, 127402 (2006). [3] R.V. Mehta, R. Patel, and R. Upadhyay, Phys. Rev. B 74, 195127 (2006). [4] M. Kerker and J.P. Kratohwil, Pure Appl. Chem. 55, 931 (1983). [5] R.V. Mehta, R. Patel, B. Chudasama, H. Desai, S.P. Bhatnagar, and R.V. Upadhyay, Curr. Sci. 93, 1071 (2007). PRL 100, 229704 (2008) PHYSICAL REVIEW LETTERS week ending 6 JUNE 2008 0031-9007= 08=100(22)=229704(1) 229704-1 © 2008 The American Physical Society

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Mehta et al. Reply:Ramchandran and Kumar [1] have raised a point against

using the term ‘‘zero forward scattering’’ in our Letter [2].We used the terms forward and backward scatterings in ourpapers [2,3] in the context of the definition given by IUPAC[4]. However, we agree with their remark that what weobserve was not only the vanishing of forward scatteringbut the vanishing of total scattering. In Fig. 3(d) of ourLetter it is clearly seen that both the forward scattered aswell as transmitted intensities are zero. Our subsequentfindings also agree with their deduction that at the criticalfield light is resonantly trapped within the medium [5].

R. V. Mehta, Rajesh Patel, Rucha Desai, R. V. Upadhyay,and Kinnari Parekh*

Department of PhysicsBhavnagar UniversityBhavnagar, 364002, India

Received 11 December 2007; published 5 June 2008DOI: 10.1103/PhysRevLett.100.229704PACS numbers: 78.20.Ls, 42.70.Qs, 47.65.Cb, 75.50.Mm

*Present address: Physics Department, Faculty ofScience, M.S. University of Baroda, Vadodara, 390002,India.

[1] Hema Ramchandran and N. Kumar, preceding Comment,Phys. Rev. Lett. 100, 229703 (2008).

[2] R. V. Mehta, R. Patel, R. Desai, R. V. Upadhyay, andK. Parekh, Phys. Rev. Lett. 96, 127402 (2006).

[3] R. V. Mehta, R. Patel, and R. Upadhyay, Phys. Rev. B 74,195127 (2006).

[4] M. Kerker and J. P. Kratohwil, Pure Appl. Chem. 55, 931(1983).

[5] R. V. Mehta, R. Patel, B. Chudasama, H. Desai, S. P.Bhatnagar, and R. V. Upadhyay, Curr. Sci. 93, 1071(2007).

PRL 100, 229704 (2008) P H Y S I C A L R E V I E W L E T T E R S week ending6 JUNE 2008

http://dx.doi.org/10.1103/PhysRevLett.100.229704

Harshad Mehta