GLASSESSENTIAL® Folding Window Grilles are designed to provide elegant look, strong security barrier with ease of operation.
Check out this affordable home security idea to protect your windows from break in.
Lexan-ClearBars - Transparent Burglar Bars
Window Security Grills Burglar Bars
Decorative Window Bars - the next step. Just be sure they have a quick release, or you'll have to remove them when you sell. Fire code and all. :)
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Decorative Window Bar Security - Example 1
Blinds for French Doors –A way to secure and beautify your home | Drapery Room Ideas
US $24.99 New in Home & Garden, Window Treatments & Hardware, Window Film