Enable thumbnail via ajax

I'm uploading a gallery of images via AJAX with fancybox so I also need to put the thumbnails in this gallery how should I proceed?

Return from my JSON:

  

["title": "caption 1 .....", "href": "553e2ec2a7be4.jpg"}, {"title": "caption 1.", "href": "553f7d3c4bed5.jpg "}, {" title ":" caption 1 "," href ":" 553f7d4924889.jpg "}, {" title " ":" caption 1 "," href ":" 553f7d6459659.jpg "}]

My JS

$('#maisAlbuns').on('click', function(event){
event.preventDefault();
$.getJSON( "/fotos/3", function( data ) {
    $.fancybox(data,[
        {
            helpers: {
                thumbs: {
                    width: 40,
                    height: 40,
                    source: function (current) {
                        return $(current.element).data('href');
                    }
                }
            }
        }]);
});

});