Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Conjugate metamaterials and the perfect lens   In this letter, we show how transformation optics makes it possible to design
what we call conjugate metamaterials. We show that these materials can also
serve as substrates for making a subwavelength-resolution lens. The so-called
"perfect lens", which is a lens that could focus all components of light
(including propagating and evanescent waves), can be regarded as a limiting
case, in which the respective conjugate metamaterials approach the
characteristics of left-handed metamaterials, which have a negative refractive
index.

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The categories of this paper are: gr-qc
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The categories of this paper are: hep-th
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The categories of this paper are: nlin
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The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-ex
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: chao-dyn
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The categories of this paper are: mtrl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg